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Reconciliations between our Effective Tax Rate from Continuing Operations and U.S Federal Income Tax Rate (Detail) | 12 Months Ended
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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%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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