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Stockholders' Equity - Additional Information (Detail) - USD ($)
12 Months Ended
Feb. 16, 2017
Oct. 22, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Oct. 23, 2014
Feb. 19, 2014
Equity, Class of Treasury Stock [Line Items]              
Common stock repurchase program, termination date   Oct. 22, 2015          
Subsequent Event [Member]              
Equity, Class of Treasury Stock [Line Items]              
Number of shares repurchased by the Company 0            
Common Stock [Member]              
Equity, Class of Treasury Stock [Line Items]              
Common stock repurchase program, authorized shares           2,000,000  
Common Stock [Member] | Subsequent Event [Member]              
Equity, Class of Treasury Stock [Line Items]              
Common stock repurchase program, authorized shares 2,961,000            
October 2014 Stock Repurchase Program [Member]              
Equity, Class of Treasury Stock [Line Items]              
Number of shares repurchased by the Company       1,134,300      
Value of shares repurchased by the Company       $ 45,200,000      
October 2015 Stock Repurchase Program              
Equity, Class of Treasury Stock [Line Items]              
Number of shares repurchased by the Company     1,578,952        
Value of shares repurchased by the Company     $ 53,300,000        
Common stock repurchase program, termination date   Dec. 31, 2016          
October 2015 Stock Repurchase Program | Common Stock [Member]              
Equity, Class of Treasury Stock [Line Items]              
Common stock repurchase program, authorized shares   3,150,000          
February 2014 Stock Repurchase Program [Member]              
Equity, Class of Treasury Stock [Line Items]              
Common stock repurchase program, authorized amount             $ 50,000,000
Number of shares repurchased by the Company         1,657,919    
Value of shares repurchased by the Company         $ 50,000,000