XML 109 R94.htm IDEA: XBRL DOCUMENT v3.8.0.1
Related Party Transactions - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2015
Related Party Transaction [Line Items]    
Distributions-in-kind of common stock (in shares) 6.3  
Advisory Services and Monitoring Agreement    
Related Party Transaction [Line Items]    
Annual fee $ 1.0  
Term of agreement 7 years  
Aggregate termination fee paid   $ 6.5
INC Research Holdings, Inc.    
Related Party Transaction [Line Items]    
Term of agreement 3 years