Quarterly report pursuant to Section 13 or 15(d)

Schedule of Cash Distributions Declared and Paid (Detail)

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Schedule of Cash Distributions Declared and Paid (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dividend Payment 1st
 
Dividends Payable [Line Items]  
Announcement Date May 27, 2014
Payment Date Jun. 30, 2014
Amount Per Share $ 0.0600
Cash Distributed $ 1,514
Dividend Payment 2nd
 
Dividends Payable [Line Items]  
Announcement Date Mar. 06, 2014
Payment Date Mar. 31, 2014
Amount Per Share $ 0.0575
Cash Distributed 1,444
Dividend Payment 3rd
 
Dividends Payable [Line Items]  
Announcement Date Nov. 20, 2013
Payment Date Dec. 27, 2013
Amount Per Share $ 0.0550
Cash Distributed 1,376
Dividend Payment 4th
 
Dividends Payable [Line Items]  
Announcement Date Sep. 12, 2013
Payment Date Oct. 04, 2013
Amount Per Share $ 0.0525
Cash Distributed 1,308
Dividend Payment Five
 
Dividends Payable [Line Items]  
Announcement Date May 30, 2013
Payment Date Jun. 28, 2013
Amount Per Share $ 0.0500
Cash Distributed 1,240
Dividend Payment Six
 
Dividends Payable [Line Items]  
Announcement Date Mar. 18, 2013
Payment Date Apr. 01, 2013
Amount Per Share $ 0.0500
Cash Distributed $ 1,234