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- Summary of Restricted Stock Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted Average Grant Price      
Granted $ 96.38 $ 106.43 $ 82.14
Restricted Stock      
Shares Outstanding      
Beginning Balance 1,641,197    
Granted 545,365    
Vested (314,555)    
Canceled/Forfeited (485,998)    
Ending Balance 1,386,009 1,641,197  
Expected to vest as of end of period 1,397,750    
Weighted Average Grant Price      
Beginning Balance $ 92.19    
Granted 89.75 $ 114.42 $ 85.97
Vested 90.39    
Canceled/Forfeited 76.36    
Ending Balance 96.92 $ 92.19  
Expected to vest as of end of period $ 96.79