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Summary of Significant Accounting Policies - Additional Information (Details) |  | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) Segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Contract payment term description |  | contracts typically contain billing terms that provide for invoicing monthly or upon completion of milestones, and payment on a net 30-day basis. |  |
Contracts payment, term |  | 30 days |  |
Number of reportable segments | Segment |  | 1 |  |
Goodwill, impaired, accumulated impairment loss | $ 0 | $ 0 |  |
Goodwill, impairment loss |  | $ 0 |  |
Performance based share awards, performance period |  | 3 years |  |
Number of operating segments | Segment |  | 1 |  |
Revenue |  | $ 1,553,048,000 | $ 1,506,875,000 | $ 1,478,525,000
Foreign financial institutions, actual deposits | 20,100,000 | 20,100,000 | 81,500,000 |
Domestic bank accounts exceeded FDIC insurance limit | 2,000,000.0 | 2,000,000.0 |  |
Federal Government Agencies And Departments |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Revenue |  | $ 735,000,000.0 | $ 667,000,000.0 | $ 561,000,000.0
Federal Government Agencies And Departments | Customer Concentration Risk | Sales Revenue, Net |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk, percentage |  | 47.00% | 44.00% | 38.00%
International Clients | Geographic Concentration Risk | Sales Revenue, Net |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk, percentage |  | 11.00% | 13.00% | 8.00%
International | Geographic Concentration Risk | Long-Lived Assets |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk, percentage |  | 15.00% | 15.00% |
Other Assets |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Capitalized software, net of accumulated amortization | $ 14,500,000 | $ 14,500,000 | $ 4,800,000 |
Indirect and Selling Expenses |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Impairment expense related to intangible assets |  | $ 7,900,000 | $ 3,100,000 | $ 1,700,000
Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property and equipment, estimated useful life |  | 2 years |  |
Finite-lived intangible asset, useful life | 1 year |  |  |
Minimum | Other Assets |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible asset, useful life |  | 3 years |  |
Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property and equipment, estimated useful life |  | 7 years |  |
Finite-lived intangible asset, useful life | 10 years |  |  |
Insured domestic bank accounts | $ 250,000 | $ 250,000 |  |
Maximum | Other Assets |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible asset, useful life |  | 5 years |  |

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