Investment in Equity Affiliate - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended		1 Months Ended	12 Months Ended					12 Months Ended		0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 16, 2013 Closings	Mar. 31, 2013 Petrodelta, S.A. [Member]	Dec. 31, 2013 Petrodelta, S.A. [Member]	Dec. 31, 2012 Petrodelta, S.A. [Member]	Dec. 31, 2011 Petrodelta, S.A. [Member]	Dec. 31, 2013 Harvest Holding [Member] Closings	Dec. 16, 2013 Harvest Holding [Member]	Dec. 31, 2013 Harvest Holding [Member] First Closing [Member]	Dec. 16, 2013 Harvest Holding [Member] First Closing [Member]	Dec. 31, 2013 Harvest Holding [Member] Petrodelta, S.A. [Member]	Dec. 16, 2013 Harvest Holding [Member] Petrodelta, S.A. [Member]	Dec. 31, 2013 Harvest Holding [Member] Petrodelta, S.A. [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity interest in equity affiliate				40.00%	40.00%	40.00%
Percentage of equity interest to sell as per agreement								80.00%		29.00%
Number of closings for sale of Shares		2					2
Cash purchase price for share purchase agreement								$ 400		$ 125
Loss on Sale of Interest in Harvest holding									23.0
Exemption credit			55.2
Exemption credit, net of tax			36.4
Overstatement of Sports Law contribution	1.3
Overstatement of Sports Law contribution net to interest by parent indirectly	$ 0.3
Percentage of interest owned by parent indirectly	20.40%				32.00%	32.00%					20.40%	32.00%	51.00%
Hydrocarbon contract term	20 years
Participation required for decision making process				75.00%
Contract Price per MCF of gas				1.54
Collection period for obligated to make payment to Petrodelta				60 days