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Recorded Amounts and Estimated Fair Values of Long-term Debt and Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Derivative [Line Items] |  |
Total debt | $ 2,457,374 | $ 1,309,087
Carrying (Reported) Amount, Fair Value Disclosure |  |
Derivative [Line Items] |  |
Variable rate debt | 427,706 | 406,978
Fixed rate debt | 2,029,669 | 902,109
Total debt | 2,457,375 | 1,309,087
Estimate of Fair Value, Fair Value Disclosure |  |
Derivative [Line Items] |  |
Variable rate debt | 427,706 | 406,978
Fixed rate debt | 2,081,264 | 954,053
Total debt | $ 2,508,970 | $ 1,361,031

X
- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
Name: | us-gaap_DebtLongtermAndShorttermCombinedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant