Reconciliation of Beginning and Ending Fair Value Measurements of Level Three Contingent Earnout Arrangements Related to Company's Acquisitions (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Jun. 30, 2017
Contingent earnout arrangements
Payment on earnout consideration	$ (2,500)	$ (2,000)
Fair Value, Inputs, Level 3
Business Acquisition Contingent Consideration [Line Items]
Balance - beginning of period	7,429
Contingent earnout arrangements
Payment on earnout consideration	(2,500)
Other earnout arrangement	2,597
Balance - end of period	7,021
Fair Value, Inputs, Level 3 | Other Expense, (Income)
Contingent earnout arrangements
Changes in fair value recorded in other expense, (income)	$ (505)