XML 62 R51.htm IDEA: XBRL DOCUMENT v3.10.0.1
Goodwill - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Goodwill [Line Items]      
Goodwill impairment $ 8,288 $ 0 $ 8,288