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Solar Energy Systems, Net - Components of Solar Energy Systems, Net (Parenthetical) (Detail) - Solar Energy Systems [Member] - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Finance Leased Assets [Line Items]    
Gross finance leased assets $ 36.0 $ 36.0
Accumulated depreciation and amortization on finance leased assets $ 4.7 $ 3.8