Related Party Transactions - Summary of Related Party Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Related Party Transaction [Line Items]
Total related party expenses	$ 266	$ 418	$ 623	$ 645
Pharmacovigilance Services [Member] | INC Research Holdings, Inc. [Member]
Related Party Transaction [Line Items]
Total related party expenses		332		456
Avista [Member] | Offering Costs Paid Pursuant to Registration Rights Agreement [Member]
Related Party Transaction [Line Items]
Total related party expenses	177		326
VWR Scientific [Member] | Inventory Supplies [Member]
Related Party Transaction [Line Items]
Total related party expenses	$ 89	$ 86	$ 297	$ 189