Property and Equipment - Schedule of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 31, 2016
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 92,543	$ 70,816
Less: accumulated depreciation and amortization	(43,214)	(30,669)
Total property and equipment, net	49,329	40,147
Computers, software, and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	6,967	4,835
Site operation equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	21,774	14,793
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	1,762	917
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	30,528	22,217
Capitalized software development costs
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 31,512	$ 28,054