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Income Taxes - Schedule of Differences Between Effective Rate and United States Federal Income Tax Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax at statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income tax, net of federal benefit	2.74%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	2.63%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	2.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Non-deductible expenses	0.33%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.27%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.36%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Change in accrual estimates relating to uncertain tax positions	(0.59%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.48%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.15%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Other, net	0.15%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.02%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.13%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent
Income tax provision	37.63%us-gaap_EffectiveIncomeTaxRateContinuingOperations	37.44%us-gaap_EffectiveIncomeTaxRateContinuingOperations	37.94%us-gaap_EffectiveIncomeTaxRateContinuingOperations

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Section 50

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(2))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Subparagraph 2

-Article 4

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I)

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- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

+ References

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

+ References

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-Publisher FASB

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-Topic 740

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