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Acquisitions and Recent Transactions - Additional Information (Detail) (USD $)
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Mar. 14, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Jan. 10, 2014
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Dec. 31, 2013
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May 27, 2014
Second Quarter Dividend
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Sep. 30, 2014
Second Quarter Dividend
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Mar. 06, 2014
First Quarter Dividend
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Sep. 30, 2014
First Quarter Dividend
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Sep. 02, 2014
Third Quarter Dividend
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Sep. 30, 2014
Third Quarter Dividend
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Sep. 29, 2014
Term Loan B
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Mar. 31, 2014
Term Loan B
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Sep. 29, 2014
Term Loan B
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Jan. 10, 2014
Eagle Publishing (business acquisition)
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Sep. 30, 2014
Eagle Publishing (business acquisition)
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Jan. 10, 2014
Eagle Publishing (business acquisition)
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Jun. 06, 2014
Eagle Publishing (business acquisition)
January 2015
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Sep. 30, 2014
Eagle Publishing (business acquisition)
January 2015
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Jan. 10, 2014
Eagle Publishing (business acquisition)
January 2015
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Jan. 10, 2014
Eagle Publishing (business acquisition)
January 2016
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Sep. 30, 2014
Eagle Publishing (business acquisition)
January 2016
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Jan. 10, 2014
Eagle Publishing (business acquisition)
January 2016
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Sep. 30, 2014
WOCN-AM Miami, Florida (business acquisition)
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May 22, 2014
WOCN-AM Miami, Florida (business acquisition)
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Sep. 30, 2014
WRTH-FM (formerly WOLT-FM), Greenville, South Carolina (business acquisition)
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May 06, 2014
WRTH-FM (formerly WOLT-FM), Greenville, South Carolina (business acquisition)
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Sep. 30, 2014
KDIS-FM, Little Rock Arkansas and KRDY-AM, San Antonio, Texas (business acquisition)
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Feb. 07, 2014
KDIS-FM, Little Rock Arkansas and KRDY-AM, San Antonio, Texas (business acquisition)
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Sep. 30, 2014
Purchase of various intangible Internet assets (asset purchases)
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Sep. 30, 2014
FM Translators, Orlando, Florida, Tampa, Florida, Omaha, Nebraska (asset purchase)
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Apr. 15, 2014
FM Translators, Orlando, Florida, Tampa, Florida, Omaha, Nebraska (asset purchase)
Translator
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Sep. 30, 2014
KXXT-AM in Phoenix, Arizona
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May 29, 2014
KXXT-AM in Phoenix, Arizona
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| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||||||||||||||||||||||||||||||||||
| Debt, issuance of principal amount | $ 300,000,000 | |||||||||||||||||||||||||||||||||||
| Repayment of Term Loan B | 5,000,000 | 2,300,000 | ||||||||||||||||||||||||||||||||||
| Pre-tax loss on the early retirement of debt | 33,000 | 18,000 | 16,000 | 26,000 | 27,792,000 | 18,000 | 8,000 | |||||||||||||||||||||||||||||
| Class A and Class B common stock, dividend declared date | May 27, 2014 | Mar. 06, 2014 | Sep. 02, 2014 | |||||||||||||||||||||||||||||||||
| Class A and Class B common stock, dividend declared per share | $ 0.06 | $ 0.0575 | $ 0.0625 | |||||||||||||||||||||||||||||||||
| Class A and Class B common stock, dividend paid | 4,537,000 | 2,474,000 | 1,500,000 | 1,400,000 | 1,600,000 | |||||||||||||||||||||||||||||||
| Class A and Class B common stock, payment date | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2014 | |||||||||||||||||||||||||||||||||
| Class A and Class B common stock, record date | Jun. 16, 2014 | Mar. 17, 2014 | Sep. 16, 2014 | |||||||||||||||||||||||||||||||||
| Acquisition date | Jan. 10, 2014 | May 22, 2014 | May 06, 2014 | Feb. 07, 2014 | Apr. 15, 2014 | Oct. 01, 2014 | ||||||||||||||||||||||||||||||
| Purchase price | 16,952,000 | 8,500,000 | 10,628,000 | 2,450,000 | 1,125,000 | 1,984,000 | 357,000 | |||||||||||||||||||||||||||||
| Amount due on close of transaction | 3,500,000 | |||||||||||||||||||||||||||||||||||
| Deferred amount payable | 2,500,000 | 2,500,000 | ||||||||||||||||||||||||||||||||||
| Acquisition payment date | 2015-01 | 2016-01 | ||||||||||||||||||||||||||||||||||
| Additional costs associate associated with liabilities incurred by the seller | 400,000 | |||||||||||||||||||||||||||||||||||
| Early payment made | 1,500,000 | |||||||||||||||||||||||||||||||||||
| Deferred payments, present value | 900,000 | 2,300,000 | ||||||||||||||||||||||||||||||||||
| Contingent earn-out consideration | 8,500,000 | |||||||||||||||||||||||||||||||||||
| Contingent earn-out consideration achievement of milestone period | 3 years | |||||||||||||||||||||||||||||||||||
| Estimated fair value of contingent earn-out consideration | 2,000,000 | |||||||||||||||||||||||||||||||||||
| Goodwill | 24,727,000 | 24,727,000 | 2,300,000 | 22,374,000 | 12,000,000 | 6,400,000 | 18,000 | |||||||||||||||||||||||||||||
| Business acquisition purchase price | $ 2,450,000 | $ 1,125,000 | $ 1,984,000 | $ 203,000 | $ 357,000 | $ 600,000 | ||||||||||||||||||||||||||||||
| Number of FM translators acquired | 3 | |||||||||||||||||||||||||||||||||||
| Business acquisition, APA date | May 29, 2014 | |||||||||||||||||||||||||||||||||||
| Business acquisition closed date | Oct. 01, 2014 | |||||||||||||||||||||||||||||||||||