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Debt - Consolidated Debt Obligations (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
May 04, 2017
Line Of Credit Facility [Line Items]      
Long-term debt $ 285,000 $ 294,000 $ 430,000
Credit Facility [Member]      
Line Of Credit Facility [Line Items]      
Aggregate principal outstanding $ 285,000 $ 294,000