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Share-Based Compensation - Certain Information Regarding Company's Share-Based Compensation (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense, Total $ 13,008 $ 12,786 $ 10,515
Deferred tax benefits, Total 1,754 2,830 4,019
Realized tax benefits, Total 1,777 8,877 7,095
Excess tax benefits (shortfall) 641 5,427 5,793
Intrinsic value of options exercised 2,343 32,217 15,256
Vesting of performance share units 2,069 1,273 1,183
Cash received for strike price and tax withholdings $ 238 $ 120 $ 0
Shares acquired through cashless exercise 186 1,361 491
Value of shares acquired through cashless exercise $ 6,133 $ 49,199 $ 12,808
Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense, Stock options 6,516 7,579 6,907
Deferred tax benefits, Total 1,522 1,877 2,640
Realized tax benefits, Total 577 7,957 5,831
Excess tax benefits (shortfall) $ 415 $ 5,330 $ 5,548
Weighted average fair value per option or share, Stock option grants (in dollars per share) $ 9.82 $ 11.74 $ 10.18
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 3,104 $ 609 $ 0
Deferred tax benefits, Total 47 8 0
Realized tax benefits, Total 37 0 0
Excess tax benefits (shortfall) $ (18) $ 0 $ 0
Granted, weighted average grant date fair value (in dollars per share) $ 30.73 $ 33.64 $ 0
Vesting of performance share units $ 2,783 $ 632 $ 0
Performance Share Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 2,508 4,598 3,608
Deferred tax benefits, Total 185 945 1,379
Realized tax benefits, Total 1,163 920 1,264
Excess tax benefits (shortfall) $ 244 $ 97 $ 245
Granted, weighted average grant date fair value (in dollars per share) $ 33.47 $ 32.51 $ 27.20
Vesting of performance share units $ 5,520 $ 3,726 $ 3,307
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 880 0 0
Deferred tax benefits, Total 0 0 0
Realized tax benefits, Total 0 0 0
Excess tax benefits (shortfall) $ 0 $ 0 $ 0
Granted, weighted average grant date fair value (in dollars per share) $ 26.47 $ 0 $ 0
Vesting of performance share units $ 657 $ 0 $ 0