Fair Value of Financial Instruments - Other Investments - Other Equity Method Investments - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Dec. 31, 2021	Mar. 31, 2021
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, net investment	$ 300,000,000		$ 300,000,000		$ 300,000,000	$ 267,000,000
Equity method investments, equity in earnings (losses)	6,059,000	$ 8,714,000	19,423,000	$ 23,585,000
Telecommunications Equity Method Investees
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, net investment	21,000,000		21,000,000		21,000,000	20,000,000
Equity method investments, equity contributions	0	0	1,100,000	2,000,000
Equity method investments, equity in earnings (losses)	400,000	600,000	(500,000)
Payments for advance to affiliate	2,000,000	200,000	2,000,000	200,000
Telecommunications Equity Method Investees | Subcontracting Arrangements
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Expenses, related party	2,600,000	3,200,000	5,100,000	7,300,000
Payables, related party	400,000		400,000		400,000	300,000
Telecommunications Equity Method Investees | Employee Leasing and Advanced Receivable Arrangement
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Receivables, related party	2,500,000		2,500,000		2,500,000	900,000
FM Tech
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, net investment	$ 18,000,000		$ 18,000,000		$ 18,000,000	17,000,000
Equity method investments, ownership percentage	50.00%		50.00%		50.00%
Certain Entities, Each Accounted for Using Equity Method Investments
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, net investment	$ 3,000,000		$ 3,000,000		$ 3,000,000	4,000,000
Equity method investments, equity in earnings (losses)	(100,000)		(400,000)
Expenses, related party	$ 800,000		$ 5,800,000
Equity method investments, ownership percentage	49.00%		49.00%		49.00%
Payables, related party	$ 100,000		$ 100,000		$ 100,000
Line of credit, amount drawn	4,500,000		4,500,000		4,500,000	8,500,000
Certain Entities, Each Accounted for Using Equity Method Investments | Other Current Assets
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Line of credit, amount drawn	$ 500,000		500,000		500,000	$ 400,000
Confluence
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, equity contributions		300,000	200,000	1,300,000	$ 1,900,000
Equity method investments, equity in earnings (losses)		$ (200,000)	$ 300,000	$ (600,000)
Equity method investments, ownership percentage							75.00%
Financing commitments (up to)							$ 2,500,000