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Schedule of Equity in Nonconsolidated Investment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Nov. 30, 2017
Schedule Of Equity Method Investments [Line Items]      
Equity Investment, Ownership Percentage 93.80%   93.80%
Equity Investment $ 76,441 $ 69,215  
Equity Investment      
Schedule Of Equity Method Investments [Line Items]      
Equity Investment $ 58,400 $ 56,300  
Nonconsolidated Investment | Equity Investment | USA      
Schedule Of Equity Method Investments [Line Items]      
Equity Investment, Ownership Percentage 93.80%    
Equity Investment $ 58,376