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Income Taxes - Schedule of Reconciliation of Statutory U.S. Federal Income Tax Rate to Effective Income Tax Rate for Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation
Statutory U.S. federal income tax rate	(35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	(35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	(35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State and local income taxes	(4.30%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	(4.00%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	(4.10%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Nondeductible goodwill	1.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense	3.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense	39.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Valuation allowance	39.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	86.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	2.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Federal Audit Settlement	4.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsDomestic
Tax credits		(6.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Other	(0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(10.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(8.60%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate	5.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations	34.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations	(5.70%)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



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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))

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-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

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-Publisher FASB

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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 changes in the valuation allowance for deferred tax assets.

+ 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 nondeductible expenses.

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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 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).

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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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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 domestic income tax settlement.

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