Annual report pursuant to Section 13 and 15(d)

Nature of Business and Significant Accounting Policies - Narrative (Details)

v3.20.4
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