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Non-Vested Stock Units (Detail) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Non-Vested Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Non-vested Stock Outstanding, Beginning Balance 500,888      
Non-vested Stock Granted, Number of Shares 21,202      
Non-vested Stock Vested, Number of Shares (222,783)      
Non-vested Stock Canceled, Forfeited or Expired, Number of Shares (89,929)      
Non-vested Stock Outstanding, Ending Balance 209,378 500,888    
Non-vested Stock Outstanding, Beginning Balance, Weighted Average Grant Date Fair Value $ 18.24      
Non-vested Stock Granted, Weighted Average Grant Date Fair Value 50.55 $ 28.48 $ 16.38  
Non-vested Stock Vested, Weighted Average Grant Date Fair Value 18.00      
Non-vested Stock Canceled, Forfeited or Expired, Weighted Average Grant Date Fair Value 17.26      
Non-vested Stock Outstanding, Ending Balance, Weighted Average Grant Date Fair Value $ 22.20 $ 18.24    
Non-Vested Stock Units - Service-Based and Performance-Based [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Non-vested Stock Outstanding, Beginning Balance 151,063      
Non-vested Stock Granted, Number of Shares 182,796      
Non-vested Stock Vested, Number of Shares (44,729)      
Non-vested Stock Canceled, Forfeited or Expired, Number of Shares (64,273)      
Non-vested Stock Outstanding, Ending Balance 224,857 151,063    
Non-vested Stock Outstanding, Beginning Balance, Weighted Average Grant Date Fair Value $ 39.44      
Non-vested Stock Granted, Weighted Average Grant Date Fair Value 46.29 $ 39.54    
Non-vested Stock Vested, Weighted Average Grant Date Fair Value 34.83      
Non-vested Stock Canceled, Forfeited or Expired, Weighted Average Grant Date Fair Value 42.41      
Non-vested Stock Outstanding, Ending Balance, Weighted Average Grant Date Fair Value $ 45.08 $ 39.44    
Non-Vested Stock Units - Service-Based and Market-Based [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Non-vested Stock Outstanding, Beginning Balance 164,534      
Non-vested Stock Granted, Number of Shares 93,257      
Non-vested Stock Vested, Number of Shares (248,654)      
Non-vested Stock Canceled, Forfeited or Expired, Number of Shares (9,137)      
Non-vested Stock Outstanding, Ending Balance 0 164,534    
Non-vested Stock Outstanding, Beginning Balance, Weighted Average Grant Date Fair Value $ 10.51      
Non-vested Stock Granted, Weighted Average Grant Date Fair Value 10.51      
Non-vested Stock Vested, Weighted Average Grant Date Fair Value 10.51      
Non-vested Stock Canceled, Forfeited or Expired, Weighted Average Grant Date Fair Value 10.51      
Non-vested Stock Outstanding, Ending Balance, Weighted Average Grant Date Fair Value $ 0 $ 10.51    
Forward Interest Rate, Minimum       0.327%
Forward Interest Rate, Maximum       1.46%
Expected Volatility       54.38%
Requisite Service Period       3 years
Fair Value       $ 10.51
Non Vested Stock Units Service [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Non-vested Stock Outstanding, Beginning Balance 183,332      
Non-vested Stock Granted, Number of Shares 147,896      
Non-vested Stock Vested, Number of Shares (32,607)      
Non-vested Stock Canceled, Forfeited or Expired, Number of Shares (49,192)      
Non-vested Stock Outstanding, Ending Balance 249,429 183,332    
Non-vested Stock Outstanding, Beginning Balance, Weighted Average Grant Date Fair Value $ 37.89      
Non-vested Stock Granted, Weighted Average Grant Date Fair Value 45.60 $ 37.98    
Non-vested Stock Vested, Weighted Average Grant Date Fair Value 38.81      
Non-vested Stock Canceled, Forfeited or Expired, Weighted Average Grant Date Fair Value 39.38      
Non-vested Stock Outstanding, Ending Balance, Weighted Average Grant Date Fair Value $ 42.05 $ 37.89