Segment and Geographical Information - Reconciliation of Segments EBITDA to Loss Before Income Taxes and Equity in Earnings (Losses) of Unconsolidated Investees (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020
Segment Reporting Information [Line Items]
Segment adjusted EBITDA	$ (86,501)	$ 146,405	$ (64,029)	$ 223,084
Construction revenue on solar services contracts	323,636	274,806	938,961	783,019
Stock-based compensation expense			19,776	18,788
Net loss (income) attributable to noncontrolling interests	69	488	(1,482)	(1,199)
Operating Segments
Segment Reporting Information [Line Items]
Segment adjusted EBITDA	22,043	13,557	74,261	10,824
Segment Reconciling Items
Segment Reporting Information [Line Items]
Legacy utility and power plant projects	0	0	0	207
Construction revenue on solar services contracts	0	0	0	(5,392)
Results of operations of legacy business to be exited	0	0	625	0
Income (Loss) From Continuing Operations Before Income Taxes Minority Interest And Income (Loss) From Equity Method Investments | Segment Reconciling Items
Segment Reporting Information [Line Items]
Legacy utility and power plant projects	0	0	0	34
Legacy sale-leaseback transactions	0	0	0	(20)
Mark-to-market gain (loss) on equity investments	(86,254)	155,431	(47,238)	274,362
Gain (loss) on sale and impairment of residential lease assets	249	83	6,219	1,122
Construction revenue on solar services contracts	0	0	0	(4,734)
Stock-based compensation expense	(4,726)	(4,454)	(19,776)	(13,387)
Amortization of intangible assets	0	(1,189)	0	(4,759)
Gain (loss) on business divestitures, net	(81)	0	143	10,529
Transaction-related costs	(1,328)	0	(1,683)	(1,862)
Executive transition costs	(827)	0	(1,329)	0
Business reorganization costs	(1,045)	0	(2,903)	0
Restructuring credits (charges)	230	97	(4,344)	(2,738)
Results of operations of legacy business to be exited	(82)	0	(9,179)	0
Litigation	(1,623)	(395)	(10,326)	(880)
Gain on convertible debt repurchased	0	104	0	3,060
Net loss (income) attributable to noncontrolling interests	69	230	(1,482)	(2,512)
Cash interest expense, net of interest income	(6,628)	(6,918)	(22,149)	(24,102)
Depreciation and amortization	(1,929)	(5,156)	(8,757)	(12,589)
Income (Loss) From Continuing Operations Before Income Taxes Minority Interest And Income (Loss) From Equity Method Investments | Corporate
Segment Reporting Information [Line Items]
Segment adjusted EBITDA	$ (4,569)	$ (4,985)	$ (15,486)	$ (9,264)