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Treasury Stock - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Stockholders Equity [Line Items]  
Expiration date on repurchase authorizations Sep. 30, 2014
Aggregate cost shares of common stock $ 639
Common stock acquired, shares 14
Common Stock [Member]
  
Stockholders Equity [Line Items]  
Common stock acquired, shares 2,764
Since Approval of Share Repurchase Plan [Member]
  
Stockholders Equity [Line Items]  
Aggregate cost shares of common stock 48,098
Remaining authorized repurchase amount 26,902
Maximum [Member]
  
Stockholders Equity [Line Items]  
Authorization amount for repurchase of common stock $ 75,000