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Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share Diluted Other Disclosures [Abstract]        
Net income $ 12,242 $ 129 $ 20,096 $ 1,244
Shares of common stock and common stock equivalents:        
Weighted averages shares used in basic computation 125,771 121,920 125,605 120,551
Dilutive effect of stock options and unvested restricted stock 14,310 16,557 14,111 17,197
Weighted averages shares used in dilutive computation 140,081 138,477 139,716 137,748
Basic earnings per share $ 0.10 $ 0.00 $ 0.16 $ 0.01
Dilutive earnings per share $ 0.09 $ 0.00 $ 0.14 $ 0.01