SHAREHOLDERS' EQUITY - Additional Information (Detail) (Share Repurchase Authorization 2008)	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Share Repurchase Authorization 2008
Stockholders Equity Note [Line Items]
Common stock, share repurchase	0	5,100,000
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