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Treasury Stock - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 9 Months Ended
Sep. 23, 2014
Sep. 30, 2014
Stockholders Equity [Line Items]    
Expiration date on repurchase authorizations Sep. 30, 2015  
Aggregate cost shares of common stock   $ 1,676
Common stock acquired, shares   38
Common Stock [Member]
    
Stockholders Equity [Line Items]    
Common stock acquired, shares   2,787
Since Approval of Share Repurchase Plan [Member]
    
Stockholders Equity [Line Items]    
Aggregate cost shares of common stock   49,135
Remaining authorized repurchase amount   25,865
Maximum [Member]
    
Stockholders Equity [Line Items]    
Authorization amount for repurchase of common stock   $ 75,000