Goodwill, Intangible Assets and Impairment Charges - Additional Information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill And Intangible Assets [Line Items]
Impairment of goodwill and intangible assets		$ 0	$ 0	$ 0
Customer Relationships
Goodwill And Intangible Assets [Line Items]
Intangible assets recognized in conjunction with acquisition	$ 1,200,000