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- Summary of Restricted Stock Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Weighted Average Grant Price      
Granted $ 82.14    
Restricted Stock      
Shares Outstanding      
Beginning Balance 1,521,202    
Granted 526,119    
Vested (84,663)    
Canceled/Forfeited (342,033)    
Ending Balance 1,620,625 1,521,202  
Expected to vest as of end of period 1,176,085    
Weighted Average Grant Price      
Beginning Balance $ 103.05    
Granted 85.97 $ 77.53 $ 139.50
Vested 134.23    
Canceled/Forfeited 116.55    
Ending Balance 93.03 $ 103.05  
Expected to vest as of end of period $ 87.92