Fair Value of Financial Instruments - Other Investments - Other Equity Investments (Details) - USD ($)	12 Months Ended			24 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2022
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, net investment	$ 306,000,000	$ 267,000,000		$ 306,000,000
Equity method investments, equity contributions	900,000
Equity method investments, equity in earnings (losses)	28,836,000	33,830,000	$ 29,738,000
Subcontracting Arrangements
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Receivables, related party	2,300,000	2,300,000		2,300,000
Confluence
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Financing commitments		2,500,000
Equity method investments, equity contributions	200,000	1,700,000		1,900,000
Equity method investments, equity in earnings (losses)	(400,000)	$ (700,000)
Equity method investment, ownership percentage		75.00%
FM Tech
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, net investment	$ 18,000,000	$ 17,000,000		$ 18,000,000
Equity method investments, equity contributions		2,000,000
Equity method investment, ownership percentage	50.00%			50.00%
FM Tech | Equity Method Investments
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Financing commitments	$ 3,000,000	3,000,000		$ 3,000,000
FM Tech | Maximum | Equity Method Investments
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Financing commitments	7,000,000			7,000,000
Telecommunications Equity Method Investees
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, net investment	21,000,000	20,000,000		21,000,000
Equity method investments, equity contributions	1,000,000	2,000,000	0
Equity method investments, equity in earnings (losses)	(300,000)	(700,000)	(1,500,000)
Telecommunications Equity Method Investees | Subcontracting Arrangements
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Payments, related party	7,600,000	9,900,000	11,500,000
Payables, related party	200,000	300,000		200,000
Telecommunications Equity Method Investees | Employee Leasing and Advanced Receivable Arrangement
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Payments, related party	3,300,000	200,000	$ 400,000
Receivables, related party	3,800,000	900,000		3,800,000
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	4,000,000		$ 3,000,000
Equity method investments, equity in earnings (losses)	(400,000)	0
Payments, related party	$ 6,600,000
Equity method investment, ownership percentage	49.00%			49.00%
Borrowing availability	$ 4,500,000	8,500,000		$ 4,500,000
Certain Entities, Each Accounted for Using Equity Method Investments | Other Current Assets
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Borrowing availability	$ 600,000	$ 400,000		$ 600,000