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Summary of Business and Significant Accounting Policies - Depreciation and Amortization Policies for Property and Equipment (Details)
12 Months Ended
Dec. 31, 2019
Buildings | Maximum  
Property Plant And Equipment [Line Items]  
Property and equipment, useful life 35 years
Furniture and fixtures | Minimum  
Property Plant And Equipment [Line Items]  
Property and equipment, useful life 5 years
Furniture and fixtures | Maximum  
Property Plant And Equipment [Line Items]  
Property and equipment, useful life 15 years
Equipment, general office and computer | Minimum  
Property Plant And Equipment [Line Items]  
Property and equipment, useful life 3 years
Equipment, general office and computer | Maximum  
Property Plant And Equipment [Line Items]  
Property and equipment, useful life 5 years
Software developed for internal use | Minimum  
Property Plant And Equipment [Line Items]  
Property and equipment, useful life 3 years
Software developed for internal use | Maximum  
Property Plant And Equipment [Line Items]  
Property and equipment, useful life 5 years