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Income Taxes - U.S. Federal Statutory Income Tax Rate Reconciled to Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense at U.S. federal statutory rate	35.00%	35.00%	35.00%
Federal tax credits	(3.08%)	(5.49%)	(3.21%)
Taxing authority audit settlements and other tax adjustments	(0.53%)	(2.67%)	(1.59%)
State and local income taxes, net of federal income tax benefit	3.31%	3.20%	1.77%
Tax impact of impairments	0.80%	0.23%	0.46%
Tax impact of divestitures	0.26%	(0.34%)	(7.89%)
Tax rate differential on foreign income	(0.63%)	(0.99%)	(0.46%)
Other	0.10%	0.17%	(0.47%)
Provision for income taxes	35.23%	29.11%	23.61%

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 disposition of a business not qualifying as a discontinued operation.

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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 impairment 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 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 income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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