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Acquisitions and Dispositions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Aug. 02, 2021 | Dec. 31, 2020 | Oct. 30, 2020 | Aug. 14, 2020 | Feb. 14, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 1,652,723 |  | $ 351,725 |  |  |  | $ 325,185
2020 Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash |  |  | 139 |  |  |  |
Accounts receivable and other current assets |  |  | 8,458 |  |  |  |
Fixed Assets |  |  | 180 |  |  |  |
Right-of-use lease assets - operating leases |  |  | 734 |  |  |  |
Intangible assets |  |  | 17,330 |  |  |  |
Other assets |  |  | 182 |  |  |  |
Advance billings |  |  | (869) |  |  |  |
Accounts payable and other current liabilities |  |  | (2,084) |  |  |  |
Long-term portion of lease liabilities |  |  | (734) |  |  |  |
Goodwill |  |  | 23,782 |  |  |  |
Purchase price consideration |  |  | $ 47,118 |  |  |  |
MDC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 130,153 |  |  |  |  |
Accounts receivable |  | 413,839 |  |  |  |  |
Other current assets |  | 41,736 |  |  |  |  |
Fixed Assets |  | 80,047 |  |  |  |  |
Right-of-use lease assets - operating leases |  | 253,629 |  |  |  |  |
Intangible assets |  | 810,900 |  |  |  |  |
Other assets |  | 16,818 |  |  |  |  |
Accounts payable |  | (170,361) |  |  |  |  |
Accruals and other liabilities |  | (309,081) |  |  |  |  |
Advance billings |  | (211,403) |  |  |  |  |
Current portion of lease liabilities |  | (48,517) |  |  |  |  |
Current portion of deferred acquisition consideration |  | (53,054) |  |  |  |  |
Long-term debt |  | (901,736) |  |  |  |  |
Revolving credit facility |  | (109,954) |  |  |  |  |
Long-term portion of deferred acquisition consideration |  | (8,056) |  |  |  |  |
Long-term portion of lease liabilities |  | (289,128) |  |  |  |  |
Other liabilities |  | (132,394) |  |  |  |  |
Redeemable noncontrolling interests |  | (25,990) |  |  |  |  |
Preferred shares |  | (209,980) |  |  |  |  |
Noncontrolling interests |  | (151,090) |  |  |  |  |
Net liabilities assumed |  | (873,622) |  |  |  |  |
Goodwill |  | 1,299,374 |  |  |  |  |
Purchase price consideration |  | $ 425,752 |  |  |  |  |
Sloane and Company LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash |  |  |  |  |  | $ 0 |
Accounts receivable and other current assets |  |  |  |  |  | 2,768 |
Fixed Assets |  |  |  |  |  | 72 |
Right-of-use lease assets - operating leases |  |  |  |  |  | 0 |
Intangible assets |  |  |  |  |  | 5,900 |
Other assets |  |  |  |  |  | 0 |
Advance billings |  |  |  |  |  | (130) |
Accounts payable and other current liabilities |  |  |  |  |  | (469) |
Long-term portion of lease liabilities |  |  |  |  |  | 0 |
Goodwill |  |  |  |  |  | 16,275 |
Purchase price consideration |  |  |  |  |  | $ 24,416 |
Kettle |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash |  |  |  |  | $ 49 |  |
Accounts receivable and other current assets |  |  |  |  | 2,732 |  |
Fixed Assets |  |  |  |  | 58 |  |
Right-of-use lease assets - operating leases |  |  |  |  | 533 |  |
Intangible assets |  |  |  |  | 1,930 |  |
Other assets |  |  |  |  | 172 |  |
Advance billings |  |  |  |  | (310) |  |
Accounts payable and other current liabilities |  |  |  |  | (552) |  |
Long-term portion of lease liabilities |  |  |  |  | (533) |  |
Goodwill |  |  |  |  | 1,323 |  |
Purchase price consideration |  |  |  |  | $ 5,402 |  |
Truelogic |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash |  |  |  | $ 90 |  |  |
Accounts receivable and other current assets |  |  |  | 2,958 |  |  |
Fixed Assets |  |  |  | 50 |  |  |
Right-of-use lease assets - operating leases |  |  |  | 201 |  |  |
Intangible assets |  |  |  | 9,500 |  |  |
Other assets |  |  |  | 10 |  |  |
Advance billings |  |  |  | (429) |  |  |
Accounts payable and other current liabilities |  |  |  | (1,063) |  |  |
Long-term portion of lease liabilities |  |  |  | (201) |  |  |
Goodwill |  |  |  | 6,184 |  |  |
Purchase price consideration |  |  |  | $ 17,300 |  |  |
Goodstuff |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents | 30,985 |  |  |  |  |  |
Accounts receivable | 28,685 |  |  |  |  |  |
Other current assets | 3,207 |  |  |  |  |  |
Fixed Assets | 237 |  |  |  |  |  |
Right-of-use lease assets - operating leases | 2,060 |  |  |  |  |  |
Intangible assets | 14,974 |  |  |  |  |  |
Other assets | 55 |  |  |  |  |  |
Accounts payable | (6,344) |  |  |  |  |  |
Accruals and other liabilities | (27,353) |  |  |  |  |  |
Advance billings | (15,956) |  |  |  |  |  |
Current portion of lease liabilities | (857) |  |  |  |  |  |
Income taxes payable | (967) |  |  |  |  |  |
Long-term portion of lease liabilities | (3,744) |  |  |  |  |  |
Other liabilities | (1,204) |  |  |  |  |  |
Net liabilities assumed | 23,778 |  |  |  |  |  |
Goodwill | 4,275 |  |  |  |  |  |
Purchase price consideration | $ 28,053 |  |  |  |  |  |

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