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Treasury Stock - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Stockholders Equity [Line Items]  
Expiration date on repurchase authorizations Sep. 30, 2014
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