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Assets and Associated Liabilities Held for Sale and Discontinued Operations - Summary of Income (Loss) from Discontinued Operations (Parenthetical) (Detail) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Aug. 31, 2019
Sep. 30, 2018
Discontinued Operations And Disposal Groups [Abstract]    
Unamortized loan costs written-off $ 0.1 $ 3.3