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Schedule of Uncertain Tax Positions and Income Tax Payable (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Mar. 31, 2017
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Income Tax [Line Items] |  |  |
Tax liabilities for uncertain tax positions | $ 19,626 | $ 18,279 |
Income tax payable | 8,995 | $ 4,050 |
Income tax receivable | $ 7,814 |  |
Predecessor |  |  |
Income Tax [Line Items] |  |  |
Tax liabilities for uncertain tax positions |  |  | $ 11,751
Income tax payable |  |  | $ 13,936

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