Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - Contingent Consideration Liabilities [Member] - USD ($) $ in Thousands	7 Months Ended	12 Months Ended
	Dec. 31, 2015	May. 31, 2015	May. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ 1,407	$ 2,015	$ 2,047
Accretion of liability	139	163	206
Foreign currency effects		(21)
Payment	(230)	(1,000)
Revaluation	(5,256)		(2,138)
Acquisitions	7,578	250	1,900
Balance, end of period	$ 3,638	$ 1,407	$ 2,015