Segment Reporting - Summary of Financial Information for Reportable Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) reportable_segment	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | reportable_segment			2
Operating revenues, net	$ 55,055	$ 29,373	$ 159,171	$ 72,860
Depreciation, accretion and amortization	13,374	6,756	40,971	12,827
Other operating costs and expenses	26,745	28,981	83,271	62,342
Interest expense (income), net	33,159	39,580	95,797	84,587
Other non-operating (income) expenses	(2,489)	39,212	(47,486)	31,714
Income tax expense (benefit)	2,121	(464)	5,040	(14)
Net loss subsequent to initial public offering	(17,855)	(84,692)	(18,422)	(118,596)
Total assets	2,494,623		2,494,623		$ 2,687,166
Operating segments | Solar
Segment Reporting Information [Line Items]
Operating revenues, net	27,963	23,323	85,580	61,742
Depreciation, accretion and amortization	6,736	2,256	19,117	8,729
Other operating costs and expenses	3,682	7,000	14,955	13,270
Interest expense (income), net	9,179	13,077	31,813	35,216
Other non-operating (income) expenses	13,961	3,429	32,510	(3,886)
Income tax expense (benefit)	0	0	0	0
Net loss subsequent to initial public offering	(5,595)	(2,439)	(12,815)	8,413
Total assets	671,692		671,692		764,475
Operating segments | Wind
Segment Reporting Information [Line Items]
Operating revenues, net	27,092	6,050	73,591	11,118
Depreciation, accretion and amortization	6,638	4,500	21,854	4,098
Other operating costs and expenses	6,629	2,956	19,957	6,075
Interest expense (income), net	(227)	1,128	(2,276)	1,854
Other non-operating (income) expenses	2,656	1,163	5,698	723
Income tax expense (benefit)	0	0	0	0
Net loss subsequent to initial public offering	11,396	(3,697)	28,358	(1,632)
Total assets	443,804		443,804		375,683
Corporate
Segment Reporting Information [Line Items]
Operating revenues, net	0	0	0	0
Depreciation, accretion and amortization	0	0	0	0
Other operating costs and expenses	16,434	19,025	48,359	42,997
Interest expense (income), net	24,207	25,375	66,260	47,517
Other non-operating (income) expenses	(19,106)	34,620	(85,694)	34,877
Income tax expense (benefit)	2,121	(464)	5,040	(14)
Net loss subsequent to initial public offering	(23,656)	$ (78,556)	(33,965)	$ (125,377)
Total assets	$ 1,379,127		$ 1,379,127		$ 1,547,008