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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
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