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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
	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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