(6) Equity Investment in Savoy (Detail) - Condensed Balance Sheet (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets	$ 34,863	$ 48,876
Other	242	580
	229,207	232,428
Total liabilities	67,198	71,435
Equity Investmentin Savoy [Member]
Current assets	16,207	16,200
Oil and gas properties, net	21,065	17,973
Other	263	2,152
	37,535	36,325
Total liabilities	9,116	9,469
Partners' capital	28,419	26,856
	$ 37,535	$ 36,325