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Minority Investments - Schedule of Net Investment Activity (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Schedule Of Results Related To Equity Accounted Investees [Line Items] |  |  |  |
Net foreign exchange rate impact | $ 691 | $ 439 | $ 656 | $ (729)
Tres Amigas |  |  |  |
Schedule Of Results Related To Equity Accounted Investees [Line Items] |  |  |  |
Beginning balance |  |  | 2,853 |
Minority interest in net losses |  |  | (499) |
Ending balance | 2,354 |  | 2,354 |
Blade Dynamics Ltd. |  |  |  |
Schedule Of Results Related To Equity Accounted Investees [Line Items] |  |  |  |
Beginning balance |  |  | 4,611 |
Net foreign exchange rate impact |  |  | 254 |
Ending balance | $ 4,865 |  | $ 4,865 |

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