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Summary of Significant Accounting Policies - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2020
PSUs or RSUs |
Disclosure of detailed information about intangible assets [line Items] |
Settlement period for share units | 3 years
Bottom of range | Client Relationships |
Disclosure of detailed information about intangible assets [line Items] |
Estimated lives | 10 years
Bottom of range | Contract backlog and finite trademarks |
Disclosure of detailed information about intangible assets [line Items] |
Estimated lives | 1 year
Top of range | Client Relationships |
Disclosure of detailed information about intangible assets [line Items] |
Estimated lives | 15 years
Top of range | Contract backlog and finite trademarks |
Disclosure of detailed information about intangible assets [line Items] |
Estimated lives | 3 years

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