Disposal and Discontinued Operations - Narrative (Detail) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended		12 Months Ended
	Aug. 31, 2015	Feb. 15, 2013	Jul. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax loss on sale of the business						$ (2,184)	$ 0	$ 0
Clinical Trial Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Aggregate amount of selling prices		$ 52,000
Amount of net working capital adjustment		100
Adjustment to reflect additional gain (loss) on disposal				$ 200
Earn-out related to certain performance-based milestones (up to)		$ 3,800		$ 3,800				$ 3,800
Release of escrow to the buyer			$ 2,300		$ 1,500
Escrow deposit term (in years)		18 months
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Cross Country Education, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration	$ 8,000
Aggregate amount of selling prices	7,500
Indemnity escrow receivable	$ 500
Earn-out held in escrow, term (in months)	12 months
Earnout (up to)	$ 500
Non-compete agreement, term (in years)	5 years
Pre-tax loss on sale of the business	$ (2,200)
Recorded tax benefit related to sale of business						(3,500)
Gain on sale of discontinued operations, net of tax						$ 1,300
Discontinued Operations | Clinical Trial Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnity escrow receivable		$ 3,800