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Fair Value of Financial Instruments - Schedule of Estimated Fair Values and Carrying Values (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Carrying Value $ 8,650,023 $ 8,410,490
Carrying Value 2,475,135 2,710,403
Senior Notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Carrying Value 1,779,546 1,778,756
Fair Value 1,563,750 1,575,000
Convertible senior notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Carrying Value 2,781,150 3,660,316
Fair Value 3,141,976 4,346,642
Participation interest [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Carrying Value 19,367 18,946
Fair Value 18,871 18,431
Solar asset-backed notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Carrying Value 1,172,288 1,183,675
Fair Value 1,205,960 1,206,755
Solar Loan-backed Notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Carrying Value 189,842 203,052
Fair Value 200,111 211,788
Automotive Asset-backed Notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Carrying Value 1,057,645 1,172,160
Fair Value $ 1,064,698 $ 1,179,910