Minority Investments - Schedule of Net Investment Activity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
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)

The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Name:	us-gaap_OtherNonoperatingIncomeExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration