Income Taxes - Reconciliation of US Statutory Federal Tax Rate (Detail)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Income Tax Reconciliation Of U S Statutory Federal Tax Rate Detail [Line Items]
US federal statutory rate	35.00%	35.00%	35.00%
State tax		2.00%
Non-US income taxed at different rates	(24.00%)	(21.00%)	(13.00%)
Enactment of US tax reform	(6.00%)
Other	7.00%		(2.00%)
Effective income tax rate	(28.00%)	15.00%	26.00%
Charges And Credits
Disclosure Income Tax Reconciliation Of U S Statutory Federal Tax Rate Detail [Line Items]
Charges and credits (See Note 3)	(40.00%)	(1.00%)	6.00%

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

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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 income tax rates.

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