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Acquisitions and Dispositions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Aug. 02, 2021 | Dec. 31, 2020 | Oct. 30, 2020 | Aug. 14, 2020 | Feb. 14, 2020
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Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 1,619,272 |  | $ 351,725 |  |  |
2020 Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fixed Assets |  |  | 180 |  |  |
Right-of-use lease assets - operating leases |  |  | 734 |  |  |
Intangible assets |  |  | 17,330 |  |  |
Other assets |  |  | 182 |  |  |
Advance billings |  |  | (869) |  |  |
Long-term portion of lease liabilities |  |  | (734) |  |  |
Goodwill |  |  | 23,782 |  |  |
Purchase price consideration |  |  | 47,118 |  |  |
Cash, cash equivalents and restricted cash |  |  | 139 |  |  |
Accounts receivable and other current assets |  |  | 8,458 |  |  |
Accounts payable and other current liabilities |  |  | $ (2,084) |  |  |
MDC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | $ 130,155 |  |  |  |
Accounts receivable |  | 419,742 |  |  |  |
Other current assets |  | 44,508 |  |  |  |
Fixed Assets |  | 80,047 |  |  |  |
Right-of-use lease assets - operating leases |  | 293,034 |  |  |  |
Intangible assets |  | 809,900 |  |  |  |
Other assets |  | 16,928 |  |  |  |
Accounts payable |  | (165,443) |  |  |  |
Accruals and other liabilities |  | (308,757) |  |  |  |
Advance billings |  | (211,687) |  |  |  |
Current portion of lease liabilities |  | (55,878) |  |  |  |
Current portion of deferred acquisition consideration |  | (53,054) |  |  |  |
Long-term debt |  | (1,011,690) |  |  |  |
Long-term portion of deferred acquisition consideration |  | (8,056) |  |  |  |
Long-term portion of lease liabilities |  | (292,497) |  |  |  |
Other liabilities |  | (131,897) |  |  |  |
Redeemable noncontrolling interests |  | (30,830) |  |  |  |
Preferred shares |  | (209,980) |  |  |  |
Noncontrolling interests |  | (158,230) |  |  |  |
Net liabilities assumed |  | (843,685) |  |  |  |
Goodwill |  | 1,270,081 |  |  |  |
Purchase price consideration |  | $ 426,396 |  |  |  |
Sloane and Company LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fixed Assets |  |  |  |  |  | $ 72
Right-of-use lease assets - operating leases |  |  |  |  |  | 0
Intangible assets |  |  |  |  |  | 5,900
Other assets |  |  |  |  |  | 0
Advance billings |  |  |  |  |  | (130)
Long-term portion of lease liabilities |  |  |  |  |  | 0
Goodwill |  |  |  |  |  | 16,275
Purchase price consideration |  |  |  |  |  | 24,416
Cash, cash equivalents and restricted cash |  |  |  |  |  | 0
Accounts receivable and other current assets |  |  |  |  |  | 2,768
Accounts payable and other current liabilities |  |  |  |  |  | $ (469)
Kettle |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fixed Assets |  |  |  |  | $ 58 |
Right-of-use lease assets - operating leases |  |  |  |  | 533 |
Intangible assets |  |  |  |  | 1,930 |
Other assets |  |  |  |  | 172 |
Advance billings |  |  |  |  | (310) |
Long-term portion of lease liabilities |  |  |  |  | (533) |
Goodwill |  |  |  |  | 1,323 |
Purchase price consideration |  |  |  |  | 5,402 |
Cash, cash equivalents and restricted cash |  |  |  |  | 49 |
Accounts receivable and other current assets |  |  |  |  | 2,732 |
Accounts payable and other current liabilities |  |  |  |  | $ (552) |
Truelogic |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fixed Assets |  |  |  | $ 50 |  |
Right-of-use lease assets - operating leases |  |  |  | 201 |  |
Intangible assets |  |  |  | 9,500 |  |
Other assets |  |  |  | 10 |  |
Advance billings |  |  |  | (429) |  |
Long-term portion of lease liabilities |  |  |  | (201) |  |
Goodwill |  |  |  | 6,184 |  |
Purchase price consideration |  |  |  | 17,300 |  |
Cash, cash equivalents and restricted cash |  |  |  | 90 |  |
Accounts receivable and other current assets |  |  |  | 2,958 |  |
Accounts payable and other current liabilities |  |  |  | $ (1,063) |  |

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