XML 14 R46.htm IDEA: XBRL DOCUMENT v2.4.0.6
Treasury Stock - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Stockholders Equity [Line Items]  
Additional amount authorized by Board of Directors $ 25,000
Authorization amount for repurchase of common stock 75,000
Expiration date on repurchase authorizations Sep. 30, 2014
Common stock acquired, shares 215
Aggregate cost shares of common stock 5,069
Since Approval Of Share Repurchase Plan [Member]
  
Stockholders Equity [Line Items]  
Authorization amount for repurchase of common stock 50,000
Common stock acquired, shares 2,625
Aggregate cost shares of common stock 44,205
Remaining authorized repurchase amount $ 5,795