Acquisitions - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Oct. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013	Dec. 02, 2013
Business Acquisition [Line Items]
Goodwill	$ 95,096		$ 90,647
Mediscan
Business Acquisition [Line Items]
Cash acquired		$ 79
Accounts receivable, net		6,851
Other current assets		140
Property and equipment		20
Goodwill		14,338
Other intangible assets		17,200
Total assets acquired		38,628
Accounts payable		306
Accrued employee compensation and benefits		1,410
Total liabilities assumed		1,716
Net assets acquired		$ 36,912
On Assignment
Business Acquisition [Line Items]
Other current assets						$ 62
Property and equipment						161
Goodwill					$ 14,600	14,554
Other intangible assets						14,000
Other assets						52
Total assets acquired						28,829
Accrued employee compensation and benefits						112
Total liabilities assumed						112
Net assets acquired						$ 28,717
Medical Staffing Network
Business Acquisition [Line Items]
Cash acquired				$ 989
Accounts receivable, net				37,275
Other current assets				3,378
Property and equipment				5,329
Goodwill				13,381
Other intangible assets				17,100
Other assets				2,325
Total assets acquired				79,777
Accounts payable				6,736
Accrued employee compensation and benefits				14,731
Other liabilities				9,867
Total liabilities assumed				31,334
Noncontrolling interest				324
Net assets acquired				$ 48,119