Discontinued Operations and Assets Held for Sale - Summarized Operating Results of the Discontinued Operations (Details) - Discontinued Operations, Held-for-sale or Disposed of by Sale - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 542,979	$ 1,674,602	$ 2,539,995
Costs and Expenses [Abstract]
Depreciation and amortization expense	0	(60,378)	(111,376)
Share-based compensation expense	(1,277)	(3,050)	(2,669)
Other direct costs	(433,127)	(1,313,258)	(2,026,187)
Loss on impairment of assets	(1,268)	(438,258)	(691)
Other non-operating expense	(22,288)	(68,553)	(70,719)
Gain on sale of discontinued operations before taxes, net	636,172	25,048	793,475
Pretax income (loss) of discontinued operations	721,191	(183,847)	1,121,828
Income tax expense	(234,326)	(114,257)	(33,681)
Income (loss) from discontinued operations, net of tax	486,865	(298,104)	1,088,147
Operating cash flows of discontinued operations	39,544	288,271	315,406
Investing cash flows of discontinued operations	(11,161)	(48,428)	(99,725)
Financing cash flows of discontinued operations	$ (18,054)	$ (969)	$ (103,583)