Income Taxes (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Reduction in taxes payable as result of exercise and vesting of equity based compensation	$ (11,090)	$ (8,781)	$ (9,603)
Excess tax benefit associated with equity based compensation	7,518	3,765	5,033
Increase (reduction) to tax expense	1,220		2,602
Repayment of debt	525,909us-gaap_RepaymentsOfLongTermDebt	493,560us-gaap_RepaymentsOfLongTermDebt	609,014us-gaap_RepaymentsOfLongTermDebt
Unrecognized tax benefits	0us-gaap_UnrecognizedTaxBenefits	0us-gaap_UnrecognizedTaxBenefits	0us-gaap_UnrecognizedTaxBenefits
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0	0
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 0	$ 0

Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount of increase (reduction) to tax expense resulting from changes in the geographical apportionment of the Company's state taxes and/or changes in state income tax rates.

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Reduction in taxes payable as result of exercise and vesting of equity based compensation

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