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Income Taxes - Reconciliation of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Tax at statutory rate | $ 28,150 | $ 24,432 | $ 23,675
State taxes, net of federal benefit | 3,548 | 2,010 | 2,717
Effect of U.S. tax reform (the Tax Act) | 13,074 | 0 | 0
Effect of net income (loss) attributable to noncontrolling interests | (1,017) | (91) | 1,492
Change in valuation allowance | (2,613) | (5,125) | 7,812
Other, net | (652) | (182) | 1,276
Income tax expense (benefit) | $ 40,490 | $ 21,044 | $ 36,972
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Tax at statutory rate | 35.00% | 35.00% | 35.00%
State taxes, net of federal benefit | 4.00% | 3.00% | 4.00%
Effect of U.S. tax reform (the Tax Act) | 16.00% | 0.00% | 0.00%
Effect of net income (loss) attributable to noncontrolling interests | (1.00%) | (0.00%) | 2.00%
Change in valuation allowance | (3.00%) | (7.00%) | 12.00%
Other, net | (1.00%) | (1.00%) | 2.00%
Income tax expense (benefit) | 50.00% | 30.00% | 55.00%

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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=84230637&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=84230637&loc=d3e32698-109319 + Details
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