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Income Taxes - Reconciliation (Detail)		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes
Income tax expense at U.S. federal statutory rate	21.00%	21.00%	35.00%	35.00%
State and local income taxes, net of federal income tax benefit		4.41%	3.25%	3.31%
Impacts of enactment of tax reform		(0.51%)	(24.14%)
Federal tax credits		(2.44%)	(2.31%)	(3.08%)
Taxing authority audit settlements and other tax adjustments		(3.85%)	0.03%	(0.53%)
Tax impact of equity-based compensation transactions		(0.54%)	(1.45%)
Tax impact of impairments		0.03%	0.66%	0.80%
Tax rate differential on foreign income		0.43%	(0.55%)	(0.63%)
Other		0.51%	0.55%	0.36%
Effective income tax rate		19.04%	11.04%	35.23%

X

- Definition

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

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