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Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]      
Net income $ 26,155 $ 80,052 $ 61,051
Shares of common stock and common stock equivalents:      
Weighted average common shares used in basic computation 134,401 137,242 131,770
Dilutive effect of common stock equivalents 1,138 1,583 6,781
Weighted average common shares used in dilutive computation 135,539 138,825 138,551
Basic earnings per share $ 0.19 $ 0.58 $ 0.46
Diluted earnings per share $ 0.19 $ 0.58 $ 0.44