Investment in Oil and Gas Properties - Additional Information (Detail) (Canada, USD $) In Millions, unless otherwise specified	3 Months Ended
Jun. 30, 2013
Canada
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Initial Investment in Oil and Gas Properties	$ 9.4

Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 18

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447

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