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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator:        
Net earnings $ 89,184 $ 58,561 $ 145,815 $ 101,729
Denominator:        
Weighted average shares used to compute basic EPS (in shares) 35,083 35,097 35,028 35,148
Dilutive potential common shares due to dilutive RSUs, net of tax effect (in shares) 199 378 265 420
Weighted average shares used to compute diluted EPS (in shares) 36,821 37,135 36,901 36,917
Net earnings per share:        
Basic (in usd per share) $ 2.54 $ 1.67 $ 4.16 $ 2.89
Diluted (in usd per share) $ 2.42 $ 1.58 $ 3.95 $ 2.76
Notes        
Denominator:        
Dilutive potential common shares due to the Notes (in shares) 1,539 1,660 1,608 1,349