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, 2019	Dec. 31, 2018	Dec. 31, 2017
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
Goodwill [Line Items]
Measurement input	0.125
Weighted Average Cost of Capital | Minimum
Goodwill [Line Items]
Measurement input		0.120	0.120
Weighted Average Cost of Capital | Maximum
Goodwill [Line Items]
Measurement input		0.150	0.140
Transaction Multiples Applied to EBITDA
Goodwill [Line Items]
Measurement input	6.0
Transaction Multiples Applied to EBITDA | Minimum
Goodwill [Line Items]
Measurement input		6.5	5.5
Transaction Multiples Applied to EBITDA | Maximum
Goodwill [Line Items]
Measurement input		9.0	7.0
Guideline Public Company Multiples Applied to EBITDA
Goodwill [Line Items]
Measurement input	6.5
Guideline Public Company Multiples Applied to EBITDA | Minimum
Goodwill [Line Items]
Measurement input		6.5	6.5
Guideline Public Company Multiples Applied to EBITDA | Maximum
Goodwill [Line Items]
Measurement input		9.5	8.0
Compounded Revenue Growth Rates
Goodwill [Line Items]
Measurement input	(0.09)
Compounded Revenue Growth Rates | Minimum
Goodwill [Line Items]
Measurement input		(0.14)	(0.14)
Compounded Revenue Growth Rates | Maximum
Goodwill [Line Items]
Measurement input		0.08	0.17