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Nature of Business and Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) tradeName segment contract | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2019
Property, Plant and Equipment [Line Items] |  |  |  |  |
Number of operating segments | segment |  | 3 |  |  |
Percentage of contracts with the government |  | 69.00% | 68.00% | 78.00% |
Number of contract types | contract |  | 3 |  |  |
Deferred compensation plan expense |  | $ 970,000 | $ 1,700,000 | $ 2,100,000 |
Impairment of intangible assets |  | 2,800,000 | $ 0 | $ 0 |
Impairment charge |  | $ (30,945,000) |  |  |
Acquired intangible assets, weighted average useful life |  | 13 years 9 months 18 days |  |  |
Aviation |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Impairment charge | $ (30,900,000) | $ (30,945,000) |  |  |
Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Lease payment term |  |  |  |  | 2 years
Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Lease payment term |  |  |  |  | 15 years
Servicing Contracts |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Acquired intangible assets, weighted average useful life |  | 14 years 2 months 12 days |  |  |
Servicing Contracts | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life |  | 5 years |  |  |
Servicing Contracts | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life |  | 18 years |  |  |
Trade names |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Number of trade names | tradeName |  | 6 |  |  |
Trade names | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life |  | 2 years |  |  |
Trade names | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life |  | 9 years |  |  |
Acquired technologies |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life |  | 11 years |  |  |
Other Capitalized Property Plant and Equipment | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 3 years |  |  |
Other Capitalized Property Plant and Equipment | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 15 years |  |  |
Land, Buildings and Improvements | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 15 years |  |  |
Land, Buildings and Improvements | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 20 years |  |  |

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