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Assets and Liabilities Held for Sale - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Discontinued Operations And Disposal Groups [Abstract]        
Impairment loss recognized on assets held for sale $ 2,190   $ 2,190  
Impairment loss on goodwill 6,151   6,151  
Impairment loss recognized on other intangible assets 3,135   3,135  
Losses before income taxes on disposal $ 12,894 $ 2,660 $ 15,378 $ 1,551