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Equity Investments - Schedule of Net Investment Activity (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Schedule Of Results Related To Equity Accounted Investees [Line Items] |  |
Net foreign exchange rate impact | $ (35) | $ (1,168)
Tres Amigas [Member] |  |
Schedule Of Results Related To Equity Accounted Investees [Line Items] |  |
Beginning balance | 2,853 |
Minority interest in net losses | (248) |
Ending balance | 2,605 |
Blade Dynamics Ltd. [Member] |  |
Schedule Of Results Related To Equity Accounted Investees [Line Items] |  |
Beginning balance | 4,611 |
Minority interest in net losses |  |
Net foreign exchange rate impact | (69) |
Ending balance | $ 4,680 |

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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591551-111686 + Details
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