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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 |

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