SHAREHOLDERS' EQUITY - Additional Information (Detail)	3 Months Ended
Mar. 31, 2011	Mar. 31, 2012 Share Repurchase Authorization 2008
Stockholders Equity Note [Line Items]
Common stock, share repurchase	3,100,000
Remaining common stock available for purchase under share repurchase authorizations		24,400,000

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant