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Property and Equipment - Additional Information (Detail)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2017
USD ($)
Aug. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
ft²
Property Plant And Equipment [Line Items]            
Property and equipment     $ 107,729 $ 42,266    
Acquisition cost for property and equipment     50,415 15,624 $ 5,188  
Depreciation expense     $ 6,200 $ 3,300 $ 2,700  
Europe            
Property Plant And Equipment [Line Items]            
Acquisition cost for property and equipment $ 12,600          
Lease Agreements | Europe            
Property Plant And Equipment [Line Items]            
Office space under lease | ft²           33,000
Capital lease assets            
Property Plant And Equipment [Line Items]            
Property and equipment   $ 16,800        
Capital lease asset, useful life   15 years        
Land | Europe            
Property Plant And Equipment [Line Items]            
Acquisition cost for property and equipment 4,000          
Building and Building Improvements | Europe            
Property Plant And Equipment [Line Items]            
Acquisition cost for property and equipment $ 8,600