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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Tax Cuts and Jobs Act incomplete accounting transition tax unrepatriated earnings foreign subsidiaries payable period         8 years
U.S. federal statutory tax rate     21.00%   35.00%
Decrease in tax expense related to reduction of deferred tax assets and liabilities     $ 700,000    
Decrease in tax expense related to Transition Tax     $ 900,000    
Effective income tax rate (15.00%) 36.00% 14.00% 34.00%  
Unrecognized tax benefits $ 0   $ 0    
Unrecognized tax benefits recorded during period     $ 0