Property and Equipment - Schedule of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 165,566	$ 120,948
Less: accumulated depreciation and amortization	(84,824)	(67,049)
Total property and equipment, net	80,742	53,899
Computers, software, and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	11,245	8,335
Site operation equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	66,727	37,254
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	3,990	2,981
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	40,541	34,316
Capitalized software development costs
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 43,063	$ 38,062