Supplemental Cash Flow Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended	1 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Apr. 30, 2012 Japan [Member] Property
Real Estate Properties [Line Items]
Ownership Interest Received As Part Of Non-cash Proceed From Contribution	$ 17.7	$ 5.0	$ 4.6
Debt assumed to acquire interest in Joint Venture				$ 61.7
Number of property owned in Japan				1

The value of an asset or business acquired 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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The total amount of [all] liabilities that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions 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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