Discontinued Operations - Schedule of Impairment Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense			$ 126,285	$ 295,239
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense	$ 0	$ 0
Discontinued Operations | Stork
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense	0		73,200	195,239
Discontinued Operations | AMECO
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense	4,809		53,085	100,000
Discontinued Operations | Goodwill | Stork
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense	0		12,700	168,568
Discontinued Operations | Goodwill | AMECO
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense	0		0	12,300
Discontinued Operations | Intangible customer relationships | Stork
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense	0		0	26,671
Discontinued Operations | Intangible customer relationships | AMECO
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense	0		0	0
Discontinued Operations | Fair value adjustment and expected costs associated with sale | Stork
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense	0		60,500	0
Discontinued Operations | Fair value adjustment and expected costs associated with sale | AMECO
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment expense	$ 4,809		$ 53,085	$ 87,700