Acquisition and Divestiture - Schedule of HCS Acquisition Purchase Price Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jul. 27, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Cash	$ 246		$ 0
Accounts receivable	7,465		0
Other assets	59		0
Intangible assets	8,669		0
Goodwill	8,205		0
Accrued compensation and benefits	(4,751)		0
Long-term debt, including current portion of $426	(683)		0
Other current liabilities	(708)		0
Purchase price	23,583		$ 0
Current portion of long term debt	$ 426
Healthcare Staffing, Inc.
Business Acquisition [Line Items]
Cash		$ 246
Accounts receivable		7,465
Other assets		59
Property and equipment		581
Goodwill		12,705
Accrued compensation and benefits		(4,751)
Long-term debt, including current portion of $426		(683)
Other current liabilities		(708)
Purchase price		23,583
Current portion of long term debt		426
Customer relationships | Healthcare Staffing, Inc.
Business Acquisition [Line Items]
Intangible assets		6,895
Trademark | Healthcare Staffing, Inc.
Business Acquisition [Line Items]
Intangible assets		1,147
Non-compete | Healthcare Staffing, Inc.
Business Acquisition [Line Items]
Intangible assets		$ 627