SHAREHOLDERS' EQUITY - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stockholders Equity Note [Line Items]
Common Stock, Voting Rights	are generally entitled to one vote per share until they have been held by the same beneficial owner for a continuous period of 48 months, at which time they become entitled to 10 votes per share.
Voting rights, votes per share	1
Share Repurchase Authorization 2008
Stockholders Equity Note [Line Items]
Common stock, share repurchase	1,900,000	6,000,000	2,000,000
Remaining common stock available for purchase under share repurchase authorizations	22,400,000
Share Held For Continuous Forty Eight Month Period [Member]
Stockholders Equity Note [Line Items]
Voting rights, votes per share	10