Power Purchase Agreement Programs - Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) variable_interest_entity MW	Dec. 31, 2019 USD ($) MW	Mar. 31, 2019 USD ($)
Variable Interest Entity [Line Items]
Number of variable interest entities | variable_interest_entity	6
Number of megawatts available for repurchase	27.5
Redeemable noncontrolling interest | $	$ 67	$ 443	$ 58,802
Minimum
Variable Interest Entity [Line Items]
Term of power purchase agreements (years)	10 years
Maximum
Variable Interest Entity [Line Items]
Term of power purchase agreements (years)	21 years
Variable Interest Entity, Primary Beneficiary | PPA IIIb
Variable Interest Entity [Line Items]
Energy server repurchased	0.4
New Energy Server Systems | PPA II
Variable Interest Entity [Line Items]
Number of replacement megawatts	30
New Energy Server Systems | PPA IIIb
Variable Interest Entity [Line Items]
Number of replacement megawatts	5.4
Write Off Of Energy Servers | Variable Interest Entity, Primary Beneficiary | PPA IIIb
Variable Interest Entity [Line Items]
Energy server repurchased		5