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Minority Investments - Schedule of Net Investment Activity (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013
Schedule Of Results Related To Equity Accounted Investees [Line Items] |  |
Net foreign exchange rate impact | $ (152) | $ 69
Tres Amigas |  |
Schedule Of Results Related To Equity Accounted Investees [Line Items] |  |
Beginning Balance | 1,845 |
Minority interest in net losses | (202) |
Ending Balance | 1,643 |
Blade Dynamics Ltd. |  |
Schedule Of Results Related To Equity Accounted Investees [Line Items] |  |
Beginning Balance | 3,690 |
Ending Balance | 3,661 |
Net foreign exchange rate impact | $ (29) |

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