EMPLOYEE STOCK OWNERSHIP PLAN - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Notes Payable	$ 2,650,200,000	$ 1,808,825,000
Employee Stock Ownership Plan (ESOP), Plan
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Notes Payable	1,500,000
Notes payable, interest rate	3.60%
Employee stock ownership plan, compensation expense	$ 1,200,000	$ 5,000,000	$ 2,500,000