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Changes In Accumulated Depreciation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Real Estate and Accumulated Depreciation [Line Items]
Beginning Balance	$ 813,926	$ 700,665	$ 629,768
Real Estate Depreciation Expense and Rental Homes	104,917	84,257	70,952
Amortization of Intangible Assets	45,122	28,479	0
Dispositions and other	308	(525)	55
Ending Balance	$ (963,657)	$ 813,926	$ 700,665

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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