Quarterly report pursuant to Section 13 or 15(d)

Equity Transactions - Additional Information (Detail)

v2.4.0.8
Equity Transactions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2014
Scenario, Forecast
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]          
Stock based compensation expenses $ 0.3 $ 0.4 $ 1.3 $ 1.5  
Estimated percentage of cash distribution on free cash flow     20.00%    
Class A and class B common stock, expected annual dividend payment         $ 6.1