Fair Value Measurement - Summary of Changes in Fair Value of Recurring Fair Value Measurements Using Unobservable Inputs (Detail) - Level 3 [Member] - Contingent Consideration [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance beginning	$ 460	$ 858	$ 578	$ 1,348
Change in fair value	7	6	9	32
Payments of contingent consideration liability	(142)	(129)	(262)	(645)
Balance ending	$ 325	$ 735	$ 325	$ 735