Related Party Transactions - Schedule of Oil and Gas Ownership Interests (Details)	3 Months Ended
	Sep. 30, 2012
Related Party Transaction [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest by a Third Party	33.30%
Dutch Number 1 - 5 [Member]
Related Party Transaction [Line Items]
Working interests	47.05%
Net revenue interest	38.12%
Dutch Number 1 - 5 [Member] | Juneau Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	1.61%
Net revenue interest	1.29%
Dutch Number 1 - 5 [Member] | Republic Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	0.00%
Net revenue interest	0.00%
Dutch Number 1 - 5 [Member] | JEX Employees [Member]
Related Party Transaction [Line Items]
Overriding royalty interest, employee benefit	2.02%
Mary Rose Number 1 - 2 [Member]
Related Party Transaction [Line Items]
Working interests	53.21%
Net revenue interest	40.45%
Mary Rose Number 1 - 2 [Member] | Juneau Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	2.01%
Net revenue interest	1.51%
Mary Rose Number 1 - 2 [Member] | Republic Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	0.00%
Net revenue interest	0.00%
Mary Rose Number 1 - 2 [Member] | JEX Employees [Member]
Related Party Transaction [Line Items]
Overriding royalty interest, employee benefit	2.79%
Mary Rose Number 3 [Member]
Related Party Transaction [Line Items]
Working interests	53.21%
Net revenue interest	38.67%
Mary Rose Number 3 [Member] | Juneau Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	2.01%
Net revenue interest	1.44%
Mary Rose Number 3 [Member] | Republic Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	0.00%
Net revenue interest	0.00%
Mary Rose Number 3 [Member] | JEX Employees [Member]
Related Party Transaction [Line Items]
Overriding royalty interest, employee benefit	2.79%
Mary Rose Number 4 [Member]
Related Party Transaction [Line Items]
Working interests	34.58%
Net revenue interest	25.49%
Mary Rose Number 4 [Member] | Juneau Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	1.31%
Net revenue interest	0.95%
Mary Rose Number 4 [Member] | Republic Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	0.00%
Net revenue interest	0.00%
Mary Rose Number 4 [Member] | JEX Employees [Member]
Related Party Transaction [Line Items]
Overriding royalty interest, employee benefit	1.82%
Mary Rose Number 5 [Member]
Related Party Transaction [Line Items]
Working interests	37.80%
Net revenue interest	27.88%
Mary Rose Number 5 [Member] | Juneau Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	1.43%
Net revenue interest	1.04%
Mary Rose Number 5 [Member] | Republic Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	0.00%
Net revenue interest	0.00%
Mary Rose Number 5 [Member] | JEX Employees [Member]
Related Party Transaction [Line Items]
Overriding royalty interest, employee benefit	1.54%
Ship Shoal 263 [Member]
Related Party Transaction [Line Items]
Working interests	100.00%
Net revenue interest	80.00%
Ship Shoal 263 [Member] | Juneau Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	0.00%
Net revenue interest	0.00%
Ship Shoal 263 [Member] | Republic Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	0.00%
Net revenue interest	0.00%
Ship Shoal 263 [Member] | JEX Employees [Member]
Related Party Transaction [Line Items]
Overriding royalty interest, employee benefit	3.33%
Vermilion 170 [Member]
Related Party Transaction [Line Items]
Working interests	83.20%
Net revenue interest	64.83%
Vermilion 170 [Member] | Juneau Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	4.30%
Net revenue interest	3.35%
Vermilion 170 [Member] | Republic Exploration LLC [Member]
Related Party Transaction [Line Items]
Working interests	12.50%
Net revenue interest	9.74%
Vermilion 170 [Member] | JEX Employees [Member]
Related Party Transaction [Line Items]
Overriding royalty interest, employee benefit	3.33%
Maximum [Member] | Contango Offshore Exploration LLC [Member]
Related Party Transaction [Line Items]
Overriding royalty interest, employee benefit	3.33%
Republic Exploration LLC [Member]
Related Party Transaction [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest	32.30%
Republic Exploration LLC [Member] | Juneau Exploration LLC [Member]
Related Party Transaction [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest	34.40%