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Income Taxes Computed at Federal Statutory Rate (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations before taxes | $ (36,925) | $ (11,421) | $ 82,783 | $ 28,670 | $ (29,092) | $ (21,766) | $ 66,996 | $ 31,138 | $ 34,400 | $ 63,107 | $ 47,276 | $ 78,672
Provision for income taxes: |  |  |  |  |  |  |  |  |  |  |  |
Tax at Federal statutory rate |  |  |  |  |  |  |  |  |  | 17,266 | 16,546 | 27,535
Effect of the tax reform on deferred taxes |  |  |  |  |  |  |  |  |  | (11,101) |  |
Impact of Partnership loss not subject to federal income taxes |  |  |  |  |  |  |  |  |  | 53 | 741 | 477
State taxes net of federal benefit |  |  |  |  |  |  |  |  |  | 1,864 | 3,170 | 5,672
Permanent differences |  |  |  |  |  |  |  |  |  | 99 | 89 | 80
Change in valuation allowance net of effect of the tax reform |  |  |  |  |  |  |  |  |  | 107 | 115 | 26
Other |  |  |  |  |  |  |  |  |  | (686) | (285) | (52)
Income tax expense |  |  |  |  |  |  |  |  |  | $ 7,602 | $ 20,376 | $ 33,738

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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