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Intangible Assets - Information About Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Intangible Assets Net Excluding Goodwill [Abstract]    
Customer relationship $ 43,800 $ 43,800
Accumulated amortization (32,911) (32,459)
Total $ 10,889 $ 11,341