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Acquisitions and Dispositions - Assets Acquired and Liabilities Assumed (Details) £ in Thousands, $ in Thousands | Dec. 31, 2022 USD ($) | Oct. 03, 2022 USD ($) | Oct. 03, 2022 GBP (£) | May 31, 2022 USD ($) | Apr. 19, 2022 USD ($) | Dec. 31, 2021 USD ($) | Aug. 02, 2021 USD ($) | Dec. 31, 2020 USD ($) | Oct. 30, 2020 USD ($) | Aug. 14, 2020 USD ($) | Feb. 14, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets |  |  |  |  |  |  |  | $ 180 |  |  |  |
Right-of-use lease assets - operating leases |  |  |  |  |  |  |  | 734 |  |  |  |
Business Combinations, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accounts Payable and Other Current Liabilities |  |  |  |  |  |  |  | (2,084) |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  | 17,330 |  |  |  |
Other assets |  |  |  |  |  |  |  | 182 |  |  |  |
Advance billings |  |  |  |  |  |  |  | (869) |  |  |  |
Long-term portion of lease liabilities |  |  |  |  |  |  |  | (734) |  |  |  |
Goodwill | $ 1,566,956 |  |  |  |  | $ 1,652,723 |  | 351,725 |  |  |  | $ 325,185
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |  | 139 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables and Other |  |  |  |  |  |  |  | 8,458 |  |  |  |
Goodstuff Holdings Limited |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  | 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 |  |  |  |  |  | 4,410 |  |  |  |  |  |
Purchase price consideration |  |  |  |  |  | 28,188 |  |  |  |  |  |
MDC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  | $ 130,197 |  |  |  |  |
Accounts receivable |  |  |  |  |  |  | 398,736 |  |  |  |  |
Other current assets |  |  |  |  |  |  | 41,291 |  |  |  |  |
Fixed assets |  |  |  |  |  |  | 81,343 |  |  |  |  |
Right-of-use lease assets - operating leases |  |  |  |  |  |  | 252,739 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  | 810,900 |  |  |  |  |
Other assets |  |  |  |  |  |  | 18,282 |  |  |  |  |
Accounts payable |  |  |  |  |  |  | (139,590) |  |  |  |  |
Accruals and other liabilities |  |  |  |  |  |  | (307,439) |  |  |  |  |
Advance billings |  |  |  |  |  |  | (211,212) |  |  |  |  |
Current portion of lease liabilities |  |  |  |  |  |  | (54,009) |  |  |  |  |
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 |  |  |  |  |  |  | (283,637) |  |  |  |  |
Other liabilities |  |  |  |  |  |  | (139,026) |  |  |  |  |
Redeemable noncontrolling interests |  |  |  |  |  |  | (25,990) |  |  |  |  |
Preferred shares |  |  |  |  |  |  | (209,980) |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  | (151,090) |  |  |  |  |
Net liabilities assumed |  |  |  |  |  |  | (861,285) |  |  |  |  |
Goodwill |  |  |  |  |  | $ 1,299,374 | 1,290,347 |  |  |  |  |
Purchase price consideration |  |  |  |  |  |  | $ 429,062 |  |  |  |  |
BNG |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | $ 2,766 |  |  |  |  |  |  |
Accounts receivable |  |  |  |  | 10,147 |  |  |  |  |  |  |
Other current assets |  |  |  |  | 671 |  |  |  |  |  |  |
Fixed assets |  |  |  |  | 1,587 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  | 12,740 |  |  |  |  |  |  |
Other assets |  |  |  |  | 1,583 |  |  |  |  |  |  |
Accounts payable |  |  |  |  | (4,771) |  |  |  |  |  |  |
Accruals and other liabilities |  |  |  |  | (6,880) |  |  |  |  |  |  |
Advance billings |  |  |  |  | (1,159) |  |  |  |  |  |  |
Other liabilities |  |  |  |  | (3,642) |  |  |  |  |  |  |
Net liabilities assumed |  |  |  |  | 13,042 |  |  |  |  |  |  |
Goodwill |  |  |  |  | 24,423 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed Less Deferred Acquisition Consideration, Net |  |  |  |  | $ 37,465 |  |  |  |  |  |  |
TMA Direct |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  | $ 582 |  |  |  |  |  |  |  |
Other current assets |  |  |  | 669 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  | 13,200 |  |  |  |  |  |  |  |
Accounts payable |  |  |  | (379) |  |  |  |  |  |  |  |
Accruals and other liabilities |  |  |  | (270) |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  | (2,667) |  |  |  |  |  |  |  |
Net liabilities assumed |  |  |  | 11,135 |  |  |  |  |  |  |  |
Goodwill |  |  |  | 6,569 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed Less Deferred Acquisition Consideration, Net |  |  |  | $ 17,704 |  |  |  |  |  |  |  |
Maru Group |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 1,033 |  |  |  |  |  |  |  |  |  |
Accounts receivable |  | 7,374 |  |  |  |  |  |  |  |  |  |
Other current assets |  | 899 |  |  |  |  |  |  |  |  |  |
Fixed assets |  | 157 |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 13,500 |  |  |  |  |  |  |  |  |  |
Other assets |  | 1,920 |  |  |  |  |  |  |  |  |  |
Accounts payable |  | (4,087) |  |  |  |  |  |  |  |  |  |
Accruals and other liabilities |  | (9,154) |  |  |  |  |  |  |  |  |  |
Advance billings |  | (6,462) |  |  |  |  |  |  |  |  |  |
Other liabilities |  | (3,591) |  |  |  |  |  |  |  |  |  |
Net liabilities assumed |  | 1,589 |  |  |  |  |  |  |  |  |  |
Goodwill |  | 24,204 |  |  |  |  |  |  |  |  |  |
Purchase price consideration |  | 25,793 | £ 23,000 |  |  |  |  |  |  |  |  |
Wolfgang |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 1,606 |  |  |  |  |  |  |  |  |  |
Accounts receivable |  | 1,180 |  |  |  |  |  |  |  |  |  |
Other current assets |  | 100 |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 1,055 |  |  |  |  |  |  |  |  |  |
Other assets |  | 46 |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities |  | (278) |  |  |  |  |  |  |  |  |  |
Net liabilities assumed |  | 3,709 |  |  |  |  |  |  |  |  |  |
Goodwill |  | 2,451 |  |  |  |  |  |  |  |  |  |
Purchase price consideration |  | 6,160 |  |  |  |  |  |  |  |  |  |
Epicenter |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 901 |  |  |  |  |  |  |  |  |  |
Other current assets |  | 45 |  |  |  |  |  |  |  |  |  |
Accounts payable |  | (148) |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other |  | (650) |  |  |  |  |  |  |  |  |  |
Net liabilities assumed |  | 7,448 |  |  |  |  |  |  |  |  |  |
Goodwill |  | 4,416 |  |  |  |  |  |  |  |  |  |
Purchase price consideration |  | $ 11,864 |  |  |  |  |  |  |  |  |  |
Sloane and Company LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets |  |  |  |  |  |  |  |  |  |  | $ 72 |
Business Combinations, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accounts Payable and Other Current Liabilities |  |  |  |  |  |  |  |  |  |  | (469) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  |  | 5,900 |
Advance billings |  |  |  |  |  |  |  |  |  |  | (130) |
Goodwill |  |  |  |  |  |  |  |  |  |  | 16,275 |
Purchase price consideration |  |  |  |  |  |  |  |  |  |  | 24,416 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |  |  |  |  | 0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables and Other |  |  |  |  |  |  |  |  |  |  | $ 2,768 |
Kettle |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets |  |  |  |  |  |  |  |  |  | $ 58 |  |
Right-of-use lease assets - operating leases |  |  |  |  |  |  |  |  |  | 533 |  |
Business Combinations, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accounts Payable and Other Current Liabilities |  |  |  |  |  |  |  |  |  | (552) |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  | 1,930 |  |
Other assets |  |  |  |  |  |  |  |  |  | 172 |  |
Advance billings |  |  |  |  |  |  |  |  |  | (310) |  |
Long-term portion of lease liabilities |  |  |  |  |  |  |  |  |  | (533) |  |
Goodwill |  |  |  |  |  |  |  |  |  | 1,323 |  |
Purchase price consideration |  |  |  |  |  |  |  |  |  | 5,402 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |  |  |  | 49 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables and Other |  |  |  |  |  |  |  |  |  | $ 2,732 |  |
Truelogic |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets |  |  |  |  |  |  |  |  | $ 50 |  |  |
Right-of-use lease assets - operating leases |  |  |  |  |  |  |  |  | 201 |  |  |
Business Combinations, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accounts Payable and Other Current Liabilities |  |  |  |  |  |  |  |  | (1,063) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  | 9,500 |  |  |
Other assets |  |  |  |  |  |  |  |  | 10 |  |  |
Advance billings |  |  |  |  |  |  |  |  | (429) |  |  |
Long-term portion of lease liabilities |  |  |  |  |  |  |  |  | (201) |  |  |
Goodwill |  |  |  |  |  |  |  |  | 6,184 |  |  |
Purchase price consideration |  |  |  |  |  |  |  |  | 17,300 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |  |  | 90 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables and Other |  |  |  |  |  |  |  |  | $ 2,958 |  |  |
2020 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 23,782 |  |  |  |
Purchase price consideration |  |  |  |  |  |  |  | $ 47,118 |  |  |  |

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