Subsequent Events (Detail) - Subsequent Event [Member]
Jul. 28, 2016
|Subsequent Event, Date||Jul. 28, 2016|
|Working Interest Ownership, Percentage||2.98%|
Date the event occurred after the balance sheet date but before financial statements are issues or available to be issued, in CCYY-MM-DD format.
Reference 1: http://www.xbrl.org/2003/role/presentationRef