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Summary of Significant Accounting Policies - Significant Estimates Used by Management in Determining Fair Values of Company's Reporting Units (Details)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]      
Years of cash flows before terminal value 5 years 5 years 5 years
Discounted cash flows 70.00% 70.00% 70.00%
Market multiple 15.00% 15.00% 15.00%
Market capitalization 15.00% 15.00% 15.00%
Weighted Average Cost of Capital | Minimum      
Goodwill [Line Items]      
Measurement input 0.120 0.120 0.125
Weighted Average Cost of Capital | Maximum      
Goodwill [Line Items]      
Measurement input 0.150 0.140 0.145
Transaction Multiples Applied to EBITDA | Minimum      
Goodwill [Line Items]      
Measurement input 6.5 5.5 5.5
Transaction Multiples Applied to EBITDA | Maximum      
Goodwill [Line Items]      
Measurement input 9.0 7.0 7.0
Guideline Public Company Multiples Applied to EBITDA | Minimum      
Goodwill [Line Items]      
Measurement input 6.5 6.5 5.5
Guideline Public Company Multiples Applied to EBITDA | Maximum      
Goodwill [Line Items]      
Measurement input 9.5 8.0 7.0
Compounded Revenue Growth Rates | Minimum      
Goodwill [Line Items]      
Measurement input (0.14) (0.14) (0.02)
Compounded Revenue Growth Rates | Maximum      
Goodwill [Line Items]      
Measurement input 0.08 0.17 0.24