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Net Earnings Per Share - 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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator:        
Net earnings $ 57,316 $ 55,483 $ 203,131 $ 157,212
Denominator:        
Weighted average shares used to compute basic EPS (in shares) 34,952 34,855 35,003 35,050
Dilutive potential common shares due to dilutive RSUs, net of tax effect (in shares) 201 381 243 407
Weighted average shares used to compute diluted EPS (in shares) 36,340 36,745 36,714 36,860
Net earnings per share:        
Basic (in usd per share) $ 1.64 $ 1.59 $ 5.80 $ 4.49
Diluted (in usd per share) $ 1.58 $ 1.51 $ 5.53 $ 4.27
Notes        
Denominator:        
Dilutive potential common shares due to the Notes (in shares) 1,187 1,509 1,468 1,403