Reconciliations between our Effective Tax Rate from Continuing Operations and U.S Federal Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	2.50%	3.50%	3.80%
International rate differential	(1.10%)	(0.20%)	0.10%
Goodwill and intangible impairments	11.70%
Changes in deferred tax valuation allowances	2.60%	0.60%	0.30%
Contingent earn-out adjustments			(2.60%)
Other	1.50%	(0.80%)	1.40%
Impact of noncontrolling interests primarily attributable to non-tax paying entities	(11.30%)	(4.00%)	(4.10%)
Effective tax rate	40.90%	34.10%	33.90%