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Treasury Stock - Additional Information (Detail)
shares in Thousands
 9 Months Ended
Sep. 30, 2016
USD ($)
shares
Stockholders Equity [Line Items]  
Expiration date on repurchase authorizations Dec. 31, 2017
Common stock acquired, shares | shares 416
Aggregate cost shares of common stock $ 15,367,000
Maximum [Member]  
Stockholders Equity [Line Items]  
Authorization amount for repurchase of common stock $ 175,000,000
Common Stock [Member]  
Stockholders Equity [Line Items]  
Common stock acquired, shares | shares 3,491
Since Initial Approval of Share Repurchase Plan in 2011 [Member]  
Stockholders Equity [Line Items]  
Aggregate cost shares of common stock $ 75,782,000
Remaining authorized repurchase amount $ 99,218,000