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Earnings Per Share - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Equity [Abstract]        
Basic and diluted weighted-average common and common shares outstanding 34,320,000 33,915,000 34,246,000 33,817,000
Weighted-average options, RSUs, shares outstanding 6,061,542 5,962,759 5,593,465 5,995,066