Acquisitions - Schedule of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Oct. 30, 2015	Jun. 30, 2014
Business Acquisition [Line Items]
Goodwill	$ 79,648	$ 95,096
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
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