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Business Combinations - Narrative (Details) $ in Thousands, £ in Millions					12 Months Ended
	Mar. 01, 2020 USD ($)	Mar. 01, 2020 GBP (£)	Jan. 01, 2020 USD ($)	Jan. 01, 2020 GBP (£)	Dec. 31, 2020 USD ($)	Mar. 01, 2020 GBP (£)	Jan. 01, 2020 GBP (£)	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Goodwill					$ 800,267			$ 774,534
H G P E Capital Limited
Business Acquisition [Line Items]
Ownership interest acquired	100.00%					100.00%
Acquisition price	$ 20,400	£ 15.9
Payments to acquire business	14,300	£ 11.2
Maximum contingent purchase price payments	4,500					£ 3.5
Revenue					33,600
Net income					$ 5,300
Intangible Assets	27,600
Goodwill	19,100
Hermes G P E
Business Acquisition [Line Items]
Acquisition-date fair value of previous equity interest	34,500
Gain as a result of remeasuring prior equity interest	$ 7,500
M E P C Limited
Business Acquisition [Line Items]
Acquisition price			$ 13,100	£ 9.9
Payments to acquire business			5,900	£ 4.4
Maximum contingent purchase price payments			7,200				£ 5.5
Intangible Assets			7,300
Goodwill			$ 1,700

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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