Basis of Presentation and Nature of Operations - Additional Information (Details) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2019 USD ($)	Sep. 30, 2019 Office Segment
Basis of Presentation and Nature of Operations [Line Items]
Number of operating segments | Segment		1
Number of reporting segments | Segment		1
Indirect and Selling Expenses
Basis of Presentation and Nature of Operations [Line Items]
Impairment expense related to intangible assets | $	$ 1.7
Domestic | Minimum
Basis of Presentation and Nature of Operations [Line Items]
Number of offices | Office		70
International
Basis of Presentation and Nature of Operations [Line Items]
Number of offices | Office		15