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- Summary of Restricted Stock Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Weighted Average Grant Price      
Granted $ 106.43 $ 82.14  
Restricted Stock      
Shares Outstanding      
Beginning Balance 1,620,625    
Granted 582,488    
Vested (158,031)    
Canceled/Forfeited (403,885)    
Ending Balance 1,641,197 1,620,625  
Expected to vest as of end of period 1,282,659    
Weighted Average Grant Price      
Beginning Balance $ 93.03    
Granted 114.42 $ 85.97 $ 77.53
Vested 101.95    
Canceled/Forfeited 123.80    
Ending Balance 92.19 $ 93.03  
Expected to vest as of end of period $ 98.28