Property and Equipment - Schedule of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 193,995	$ 165,566
Less: accumulated depreciation and amortization	(93,253)	(84,824)
Total property and equipment, net	100,742	80,742
Computers, software, and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	12,476	11,245
Site operation equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	92,326	66,727
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	4,692	3,990
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	38,050	40,541
Capitalized software development costs
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 46,451	$ 43,063