Summary of Significant Accounting Policies - Schedule Of Other Assets (Parenthetical) (Detail)	1 Months Ended	12 Months Ended
	May 31, 2011	Dec. 31, 2013	Dec. 31, 2012
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Interest Related to Dussafu PSC Drilling Operations	66.667%	66.667%	66.667%