Quarterly report pursuant to Section 13 or 15(d)

Equity Transactions - Additional Information (Detail)

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Equity Transactions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Equity [Abstract]        
Stock based compensation expenses $ 0.3 $ 0.4 $ 0.9 $ 1.2
Class A and class B common stock, expected annual dividend payment $ 6.0   $ 6.0