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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net earnings $ 55,483 $ 38,906 $ 157,212 $ 119,252
Denominator:        
Weighted average shares used to compute basic EPS 34,855 35,077 35,050 35,123
Dilutive potential common shares due to dilutive RSUs, net of tax effect 381 271 407 295
Weighted average shares used to compute diluted EPS 36,745 35,348 36,860 35,418
Net earnings per share:        
Basic $ 1.59 $ 1.11 $ 4.49 $ 3.40
Diluted $ 1.51 $ 1.10 $ 4.27 $ 3.37
Notes [Member]        
Denominator:        
Dilutive potential common shares due to the Notes 1,509   1,403