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Fair Value of Interest Rate Derivative Contracts Designated as Hedging Instruments (Detail) (Designated as Hedging Instrument, Interest Rate Swap Contract, Accounts Payable, USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Designated as Hedging Instrument \| Interest Rate Swap Contract \| Accounts Payable
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 25,927

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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