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Commitments and Contingencies - Additional Information (Detail) € in Thousands, $ in Thousands, ¥ in Millions |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Feb. 04, 2015 EUR (€) | Jan. 14, 2015 USD ($) | Aug. 29, 2014 USD ($) | Feb. 27, 2012 USD ($) | Feb. 27, 2012 CNY (¥) | Dec. 22, 2011 USD ($) | Dec. 22, 2011 CNY (¥) | Oct. 17, 2011 USD ($) | Oct. 17, 2011 CNY (¥) | Oct. 08, 2011 USD ($) | Oct. 08, 2011 CNY (¥) | Sep. 16, 2011 USD ($) | Sep. 16, 2011 CNY (¥) | Sep. 13, 2011 USD ($) | Sep. 13, 2011 CNY (¥) | May. 12, 2011 USD ($) | May. 12, 2011 EUR (€) | Mar. 31, 2015 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2015 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2011 USD ($) | Mar. 31, 2011 CNY (¥)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash included in current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,822 |  | $ 433 | $ 2,822 |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,236 |  | 795 | 1,236 |  |
Ghodawat Energy Pvt Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sought compensation amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,000 | € 18,000 |  |  |  |  |  |
Counterclaims under License Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000 | € 6,000 |  |  |  |  |  |
Liability for damages |  |  | $ 8,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate accrued on liability for damage |  |  | 5.33% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,200 | $ 500 |  |  |
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 | ¥ 105.0 | $ 190,000 | ¥ 1,200.0 | $ 157,000 | ¥ 1,000.0 | $ 58,000 | ¥ 370.0 |  |  |  |  |  |  |  |  |  |  | $ 76,000 | ¥ 485.0
Value of the undelivered components |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 720,000 | ¥ 4,600.0
Damages claimed for unauthorized use of software |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000 | ¥ 38.0 |  |  |  |  |  |  |  |
Monetary damages for trade secret infringement |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 453,000 | ¥ 2,900.0 |  |  |  |  |  |  |  |
Dalian Guotong Electric Co. Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monetary losses from copyright infringement |  |  |  |  |  |  |  |  |  |  |  | $ 200 | ¥ 1.2 |  |  |  |  |  |  |  |  |  |

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