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
Apr. 04, 2021	Mar. 29, 2020
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ (54,722)	$ 21,046
Unrealized loss on equity securities	(44,730)	49,152
Construction revenue on solar services contracts	306,398	290,546
Stock-based compensation expense	5,437	6,867
Restructuring charges	3,766	1,576
Net loss attributable to noncontrolling interests	(1,113)	(707)
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	25,015	(7,547)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Legacy utility and power plant projects	0	207
Construction revenue on solar services contracts	0	(5,392)
Results of operations of legacy business to be exited	621	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	34
Legacy sale-leaseback transactions	0	(20)
Mark-to-market loss on equity investment	(44,730)	0
Unrealized loss on equity securities	0	47,871
Gain on business divestiture	5,383	722
Construction revenue on solar services contracts	0	(4,734)
Stock-based compensation expense	(5,013)	(4,978)
Amortization of intangible assets	0	(1,786)
Transaction-related costs	(130)	(480)
Business reorganization costs	(954)	0
Restructuring charges	(3,766)	(1,576)
Litigation	(5,210)	(485)
Gain on convertible debt repurchased	0	2,956
Net loss attributable to noncontrolling interests	(1,113)	(1,379)
Cash interest expense, net of interest income	(7,914)	(8,867)
Depreciation	(3,342)	(3,500)
Income (Loss) From Continuing Operations Before Income Taxes Minority Interest And Income (Loss) From Equity Method Investments \| Corporate
Segment Reporting Information [Line Items]
Adjusted EBITDA	(5,882)	4,815
Gross Profit \| Segment Reconciling Items
Segment Reporting Information [Line Items]
Legacy utility and power plant projects	0	34
Legacy sale-leaseback transactions	0	(20)
Gain on business divestiture	(494)	(448)
Construction revenue on solar services contracts	0	(4,734)
Stock-based compensation expense	(887)	(559)
Amortization of intangible assets	0	(1,784)
Results of operations of legacy business to be exited	$ (7,066)	$ 0

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