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Disposal and Discontinued Operations - Narrative (Detail) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2015
Feb. 15, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss on sale of business     $ 0 $ 2,184 $ 0
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]          
Aggregate amount of selling prices $ 8,000        
Escrow deposit $ 500        
Earn-out held in escrow, term (in months) 12 months        
Earnout (up to) $ 500        
Loss on sale of business $ 2,200     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]          
Aggregate amount of selling prices   $ 52,000      
Escrow deposit   $ 3,800      
Held in escrow, term (in months)   18 months