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Commitments and Contingencies - Additional Information (Detail)
€ in Thousands, $ in Thousands, ¥ in Millions
3 Months Ended 12 Months Ended
Feb. 04, 2015
EUR (€)
Jan. 14, 2015
USD ($)
Feb. 27, 2012
USD ($)
Feb. 27, 2012
CNY (¥)
Oct. 08, 2011
USD ($)
Oct. 08, 2011
CNY (¥)
Sep. 13, 2011
USD ($)
Sep. 13, 2011
CNY (¥)
Mar. 31, 2015
USD ($)
Mar. 31, 2011
USD ($)
Mar. 31, 2011
CNY (¥)
Mar. 31, 2016
USD ($)
ft²
Commitments And Contingencies [Line Items]                        
Total space leased, square feet | ft²                       183,000
Restricted cash included in current assets                 $ 2,822     $ 457
Restricted cash                 1,236     $ 934
Ghodawat Energy Pvt Ltd                        
Commitments And Contingencies [Line Items]                        
Settlement amount | € € 7,450                      
Gain on reversed portion of accrued arbitration liability                 1,200      
Reimbursement of arbitration expenses   $ 2,300                    
Reversal of previously reimbursed expense                 $ 2,200      
Sinovel Wind Group Co. Ltd.                        
Commitments And Contingencies [Line Items]                        
Sought compensation amount     $ 17,000 ¥ 105 $ 190,000 ¥ 1,200 $ 76,000 ¥ 485        
Value of the undelivered components                   $ 720,000 ¥ 4,600