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Net Earnings Per Share ("EPS") - Reconciliation of Denominators of Basic and Diluted EPS Calculations (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Numerator:    
Net earnings $ 32,745 $ 13,848
Denominator:    
Weighted average shares used to compute basic EPS 35,913 35,602
Dilutive potential common shares due to dilutive RSUs, net of tax effect 350 583
Weighted average shares used to compute diluted EPS 36,263 36,185
Net earnings per share:    
Basic $ 0.91 $ 0.39
Diluted $ 0.90 $ 0.38