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Changes in Total Real Estate (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]
Noncash or Part Noncash Acquisition, Fixed Assets Acquired	$ 18,738	$ 1,431,339	$ 2,796
Balance, beginning of year	4,080,149	2,584,987	2,538,215
Real Estate, Other Acquisitions		1,431,339	2,796
Improvements	75,260	62,032	48,629
Dispositions and other	2,630	(1,791)	4,653
Balance, end of year	$ 4,171,517	$ 4,080,149	$ 2,584,987

The amount of fixed assets that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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