v2.4.1.9

Debt - Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Disclosure [Abstract]
Gross interest expense	$ 377,666us-gaap_InterestExpenseDebtExcludingAmortization	$ 471,923us-gaap_InterestExpenseDebtExcludingAmortization	$ 578,518us-gaap_InterestExpenseDebtExcludingAmortization
Amortization of premium, net	(21,440)us-gaap_AmortizationOfDebtDiscountPremium	(39,015)us-gaap_AmortizationOfDebtDiscountPremium	(36,687)us-gaap_AmortizationOfDebtDiscountPremium
Amortization of deferred loan costs	14,116us-gaap_AmortizationOfFinancingCosts	14,374us-gaap_AmortizationOfFinancingCosts	16,781us-gaap_AmortizationOfFinancingCosts
Interest expense before capitalization	370,342us-gaap_InterestCostsIncurred	447,282us-gaap_InterestCostsIncurred	558,612us-gaap_InterestCostsIncurred
Capitalized amounts	(61,457)us-gaap_InterestCostsCapitalized	(67,955)us-gaap_InterestCostsCapitalized	(53,397)us-gaap_InterestCostsCapitalized
Net interest expense	308,885us-gaap_InterestExpenseDebt	379,327us-gaap_InterestExpenseDebt	505,215us-gaap_InterestExpenseDebt
Total cash paid for interest, net of amounts capitalized	$ 258,441us-gaap_InterestPaidNet	$ 426,528us-gaap_InterestPaidNet	$ 546,627us-gaap_InterestPaidNet

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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Amount of interest capitalized during the period.

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-Glossary Allowance for Funds Used during Construction

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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