Partnership's Consolidated Balance Sheet included Assets and Liabilities of Funds (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets:
Total current assets	$ 9,565	$ 7,254
Timber, timberland and roads (net of $22,409 and $20,664 of accumulated depletion in 2013 and 2012)	256,305	259,681
Other long-term assets	263	276
Total assets	266,417	267,499
Liabilities and equity:
Current liabilities excluding long-term debt	928	993
Current portion of long-term debt	131	125
Total current liabilities	6,930	7,722
Long-term debt	43,681	43,710
Total liabilities and equity	266,417	267,499
ORM Timber Funds
Assets:
Cash	449	1,262
Other current assets	770	691
Total current assets	1,219	1,953
Timber, timberland and roads (net of $22,409 and $20,664 of accumulated depletion in 2013 and 2012)	173,735	175,410
Other long-term assets	107	111
Total assets	175,061	177,474
Liabilities and equity:
Current liabilities excluding long-term debt	1,462	1,413
Current portion of long-term debt	28	34
Total current liabilities	1,490	1,447
Long-term debt	11,000	11,002
Funds' equity	162,571	165,025
Total liabilities and equity	$ 175,061	$ 177,474