Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Timber and roads, accumulated depletion	$ 100,477	$ 93,359
Buildings and equipment, accumulated depreciation	$ 7,268	$ 6,849
General partners' capital, units issued	60,000	60,000
General partners' capital, units outstanding	60,000	60,000
Limited partners' capital, units issued	4,238,000	4,224,000
Limited partners' capital, units outstanding	4,238,000	4,224,000