Comparison of Total Assets (Parenthetical) (Detail) (Corporate Vessels, USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
Dec. 31, 2014	Mar. 31, 2014
Corporate Vessels
Segment and Geographic Distribution of Operations [Line Items]
Construction costs	$ 327.5	$ 228.9

The aggregate costs related to construction and development services during the reporting period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

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

Name:	us-gaap_ConstructionAndDevelopmentCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration