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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2018
Sep. 30, 2018
Income Taxes [Line Items]      
U.S. corporate income tax rate 35.00% 21.00%  
Net deferred tax liabilities recognized tax benefit $ 41,367    
Scenario Forecast      
Income Taxes [Line Items]      
Blended corporate tax rate     24.50%