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Reconciliation of Net Income and Weighted-Average Shares of Common Stock Outstanding for Purposes of Calculating Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Numerator:    
Net income $ 14,855 $ 10,152
Denominator:    
Weighted average shares outstanding - basic 44,214 44,109
Dilutive effect of share-based awards 628 232
Weighted average shares outstanding - diluted 44,842 44,341
Earnings per share:    
Basic $ 0.34 $ 0.23
Diluted $ 0.33 $ 0.23