USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Balance Sheet and Income Statement Location (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Balance sheet-related [Abstract]
Interest rate swap agreements at fair value, net assets (liability)	$ (21,879)				$ (11,792)
Income statement-related [Abstract]
Amounts reclassified from accumulated other comprehensive income	4,722		5,434
Other Comprehensive Income (Loss) [Member]
Other comprehensive income related [Abstract]
Increase in interest expense and decrease in Net income as a result of the use of Derivatives	(12,656)		2,479
Interest Expense [Member]
Income statement-related [Abstract]
Amounts reclassified from accumulated other comprehensive income	(4,722)		(5,434)
Amount of gain (loss) recognized (ineffective portion)	(58)		120
Increase in interest expense and decrease in Net income as a result of the use of Derivatives	(4,780)	[1]	(5,314)	[1]
Accounts Payable and Accrued Liabilities [Member]
Balance sheet-related [Abstract]
Related net interest payable	(7,647)	[2]			(5,493)	[2]
Borrowings Under Repurchase Arrangements [Member] | Other Assets [Member]
Balance sheet-related [Abstract]
Interest rate swap agreements in a gain position (an asset) related to borrowings under repurchase agreements	1,207	[3]			1,094	[3]
Borrowings under repurchase arrangements	(11,927)	[3]			(11,304)	[3]
Unsecured Borrowings [Member] | Other Assets [Member]
Balance sheet-related [Abstract]
Interest rate swap agreements in a gain position (an asset) related to borrowings under repurchase agreements	0	[3]			3,911	[3]
Borrowings under repurchase arrangements	$ (3,512)	[3]			$ 0	[3]

[1] Included in “Interest expense: Repurchase arrangements and similar borrowings” on the face of the Statement of Income.

[2] Included in “Accounts payable and accrued expenses” on the face of the Balance Sheet.

[3] The fair value of Derivatives with realized and unrealized gains are aggregated and recorded as an asset on the face of the Balance Sheet separately from the fair value of Derivatives with realized and unrealized losses that are recorded as a liability. The amount of unrealized losses at March 31, 2014 scheduled to be recognized in the Statement of Income over the next twelve months primarily in the form of fixed-rate swap payments in excess of current market rates totaled $17.6 million.