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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Equity [Abstract]    
Maximum shares authorized for repurchase, prior and new announcements and total after new announcement 50,000,000  
Stock repurchased, shares 300,000  
Shares repurchased, average price per share $ 21.44  
Additional shares authorized for purchase 4,200,000  
Number of Options, exercised 82,000  
Exercise price of stock options, lower range limit $ 15.29  
Exercise price of stock options, upper range limit $ 23.02  
Proceeds from stock option exercises $ 1,377 $ 247