Partnership's Consolidated Balance Sheet included Assets and Liabilities of Funds (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets:
Total current assets	$ 19,921	$ 7,254
Timber, timberland and roads (net of $27,279 and $20,664 of accumulated depletion)	249,175	259,681
Other long-term assets	456	564
Total assets	269,552	267,499
Liabilities and equity:
Current liabilities excluding long-term debt	712	993
Current portion of long-term debt	116	125
Total current liabilities	8,123	7,722
Long-term debt	57,628	43,710
Total liabilities and equity	269,552	267,499
ORM Timber Funds
Assets:
Cash	1,128	1,262
Other current assets	1,061	691
Total current assets	2,189	1,953
Timber, timberland and roads (net of $27,279 and $20,664 of accumulated depletion)	169,714	175,410
Other long-term assets	100	111
Total assets	172,003	177,474
Liabilities and equity:
Current liabilities excluding long-term debt	1,697	1,413
Current portion of long-term debt	11	34
Total current liabilities	1,708	1,447
Long-term debt	25,000	11,002
Total liabilities	26,708	12,449
Funds' equity	145,295	165,025
Total liabilities and equity	$ 172,003	$ 177,474