Investment in Equity Affiliate - Petrodelta - Additional Information (Detail)	3 Months Ended								12 Months Ended						12 Months Ended	1 Months Ended		3 Months Ended	12 Months Ended				1 Months Ended			1 Months Ended
	Dec. 31, 2013 USD ($)	Sep. 30, 2013 USD ($)	Jun. 30, 2013 USD ($)	Mar. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Sep. 30, 2012 USD ($)	Jun. 30, 2012 USD ($)	Mar. 31, 2012 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Feb. 28, 2013	Dec. 31, 2013 October 1, 2013 [Member]	Dec. 31, 2013 May 1, 2014 [Member]	Dec. 31, 2013 Venezuela [Member]	Feb. 28, 2013 Petrodelta, S.A. [Member] USD ($)	Nov. 30, 2010 Petrodelta, S.A. [Member] USD ($)	Dec. 31, 2013 Petrodelta, S.A. [Member] USD ($)	Dec. 31, 2013 Petrodelta, S.A. [Member] USD ($) Employee	Dec. 31, 2012 Petrodelta, S.A. [Member] USD ($)	Dec. 31, 2011 Petrodelta, S.A. [Member] USD ($)	Dec. 31, 2013 Petrodelta, S.A. [Member] VEB	Nov. 30, 2010 Petrodelta, S.A. [Member] HNR Finance [Member] USD ($)	Feb. 28, 2013 Petrodelta, S.A. [Member] Minimum [Member]	Feb. 28, 2013 Petrodelta, S.A. [Member] Maximum [Member]	Jan. 28, 2011 Fusion Geophysical Llc [Member] USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Revenue																			$ 756,700,000	$ 352,700,000
No of employees seconded into Petrodelta																			3
Advance payment									531,000	414,000	682,000								500,000
Advances to Affiliate to a long-term receivable																		800,000	800,000
Contribution of extraordinary prices															80
Contribution of exorbitant prices															80
Royalty paid in-cash									3.33%										3.33%
Royalty paid in-kind									30.00%
Royalties paid									80	70									80
Reduction in royalty																			38,400,000	113,700,000	85,000,000
Reduction in royalty net to interest by parent indirectly																			12,100,000	36,400,000	27,200,000
Percentage of interest owned by parent indirectly									20.40%											32.00%	32.00%
Royalty paid in-cash in-kind									33.33%
Gain on revaluation of its assets and liabilities																169,600,000
Change in exchange currency rate												6.3						11.3	11.3					4.3	6.3
Assets account, balance																						1,011,000,000
Liabilities account, balance																						6,683,000,000
Foreign currency loss																		14,200,000
Increase in salary	90.00%								90.00%				59.00%	23.00%
Dividends common stock cash from equity method investee																	30,600,000
Dividends declared to HNR Finance																							12,200,000
Net income/loss from equity affiliate	$ (10,242,000)	$ 25,747,000	$ 7,602,000	$ 49,471,000	$ 7,745,000	$ 20,299,000	$ 22,829,000	$ 16,896,000	$ 72,578,000	$ 67,769,000	$ 73,451,000								$ 72,578,000	$ 67,769,000	$ 72,066,000					$ 1,400,000