STOCK-BASED COMPENSATION PLANS - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended		1 Months Ended
	Dec. 31, 2011 Person Year	Dec. 31, 2010	Dec. 31, 2009	Apr. 24, 2008 Omnibus Incentive Plan	Dec. 31, 2011 Omnibus Incentive Plan	Apr. 24, 2008 Omnibus Incentive Plan Minimum	Apr. 24, 2008 Omnibus Incentive Plan Maximum
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]
Shares to be issued				7,300,000
Stock options, expiration period				10 years
Stock option, vesting period						6 months	5 years
Number of common shares that may be purchased by option holders	8,131,242
Stock option, number of participants	1,568
Stock options available for grant					1,084,260
Intrinsic value of options exercised	$ 8,700,000	$ 47,000,000	$ 9,400,000
Weighted average fair value per option at date of grant	$ 11.50	$ 11.89	$ 0.86
Stock-based compensation expense	12,908,000	32,125,000	7,109,000
Unrecognized stock-based compensation expense	$ 18,000,000
Unrecognized stock-based compensation expense, weighted average recognition period	2