Income Taxes - Effective Income Tax Rate Reconciliation (Detail)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. statutory rate	35.00%	35.00%	35.00%
Effect of foreign operations	17.40%	4.60%	5.90%
State income taxes, net of Federal income tax	0.00%	1.90%	0.90%
Change in enacted tax laws	(23.60%)	(0.20%)	0.20%
Valuation allowance adjustment with tax law change	23.60%	0.00%	0.00%
Rate differential on U.S. impairment	(4.10%)	0.00%	0.00%
Gains on asset sales, net	(2.20%)	0.00%	(0.20%)
Impairment	0.00%	(2.10%)	(12.20%)
Valuation allowance on current year operations	(14.90%)	0.00%	0.00%
Valuation allowance against previously benefitted deferred tax assets	0.10%	(97.30%)	(3.10%)
Benefit of legal entity restructuring	0.00%	0.00%	3.50%
Other	0.50%	0.40%	0.50%
Total	31.80%	(57.70%)	30.50%

Effective income tax rate reconciliation rate differential on U.S impairment, percent.

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Effective income tax rate reconciliation valuation allowance adjust with tax law change, percent.

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Effective income tax rate reconciliation valuation allowance against previously benefitted deferred tax assets, percent.

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

+ References

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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 difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to disposition of asset. Includes, but is not limited to, intra-entity transfer of asset other than inventory.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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