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Per Share Information - Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amounts Attributable to Common Stock:
Net income from continuing operations	$ 67,203us-gaap_IncomeLossFromContinuingOperations	$ 94,648us-gaap_IncomeLossFromContinuingOperations	$ 81,082us-gaap_IncomeLossFromContinuingOperations	$ 54,408us-gaap_IncomeLossFromContinuingOperations	$ 166,697us-gaap_IncomeLossFromContinuingOperations	$ 92,906us-gaap_IncomeLossFromContinuingOperations	$ 70,237us-gaap_IncomeLossFromContinuingOperations	$ 72,081us-gaap_IncomeLossFromContinuingOperations	$ 297,341us-gaap_IncomeLossFromContinuingOperations	$ 401,921us-gaap_IncomeLossFromContinuingOperations	$ 289,694us-gaap_IncomeLossFromContinuingOperations
Net income (loss) from discontinued operations									(627)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity		16,935us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income attributable to common stock	$ 66,576us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 94,648us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 81,082us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 54,408us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 166,697us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 92,906us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 70,237us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 72,081us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 296,714us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 401,921us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 306,629us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted Average Shares:
Weighted average shares outstanding for basic earnings per share									219,668us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	214,929us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	212,777us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive stock options									22us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	49us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	58us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average shares outstanding for diluted earnings per share									219,690us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	214,978us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	212,835us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition

Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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