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Fully Vested Stock Options and Stock Options Expected to Vest (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Number of Shares    
Outstanding 3,086 3,010
Exercisable 3,086  
Weighted Average Exercise Price    
Outstanding $ 32.52 $ 32.53
Exercisable $ 32.52  
Weighted Average Remaining Contractual Term (In years)    
Outstanding 4 years 29 days  
Exercisable 4 years 29 days  
Aggregate Intrinsic Value    
Outstanding $ 163,417  
Exercisable $ 163,417