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Schedule of Location of Derivatives on Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Interest rate hedge asset - Fair Value Asset Derivatives
Forward purchase commitment - Asset Derivatives found in Other Assets	26,843	6,327
Interest rate hedge liability - Fair Value Liability Derivatives	273,120	219,167
Forward purchase commitments found in Account payable and other liabilities

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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