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Long-Term Debt - Consolidated Debt Obligations (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Line Of Credit Facility [Line Items]    
Long-term debt $ 278,000 $ 294,000
New Revolving Credit Facility [Member]    
Line Of Credit Facility [Line Items]    
Aggregate principal outstanding $ 278,000 $ 294,000