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Reconciliation between U.S. Federal Income Tax Rate and our Effective Tax Rate from Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	1.20%	2.50%	3.50%
International rate differential	0.20%	(1.10%)	(0.20%)
Gain on APAC JV ownership changes	(9.80%)
Goodwill impairments	6.70%	11.70%
Changes in deferred tax valuation allowances	0.60%	2.60%	0.60%
Other	0.20%	1.50%	(0.80%)
Impact of noncontrolling interests primarily attributable to non-tax paying entities	(3.50%)	(11.30%)	(4.00%)
Effective tax rate	30.60%	40.90%	34.10%

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Effective income tax rate reconciliation gain on changes in ownership interest.

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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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