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Derivative Instruments and Hedging Activities - Commitment of Cross Currency Swaps (Parenthetical) (Detail) (Floating Rate Receivable [Member]) | Dec. 31, 2012
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Derivative [Line Items] |
LIBOR fixed | 1.12%
LIBOR rate receivable cap | 3.50%
Currency swaps maturing in 2013 [Member] |
Derivative [Line Items] |
LIBOR fixed | 1.12%
LIBOR rate receivable cap | 3.50%

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- Definition Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration