Income Taxes - Reconciliation of Effective Federal Tax Rates with Statutory Federal Income Tax Rate (Detail)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes
U.S. federal statutory rate	34.00%	34.00%	34.00%
State income taxes		(0.30%)	(0.60%)
Foreign income taxes	0.10%	(0.40%)	(0.40%)
Deferred tax valuation allowance	84.10%	(24.60%)	(26.50%)
Fair value adjustments	1.20%		(1.20%)
Revisions to prior years	(0.20%)	(0.10%)	19.10%
Goodwill impairment		(9.50%)
Other permanent items	(3.80%)	1.40%	(2.10%)
Tax rate change	(109.40%)
Effective tax rate	6.00%	0.50%	22.30%

Effective income tax rate reconciliation deductible expense impairment losses.

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Effective income tax rate reconciliation nondeductible expense fair value adjustments.

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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.

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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 statutory income tax expense (benefit) outside of the country of domicile.

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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 revisions of previously reported income tax expense.

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