Balance Sheet of Partnership Co-Investments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Fund I	Mar. 31, 2013 Fund II	Mar. 31, 2013 Fund III	Dec. 31, 2012 Fund III Northern California acre	Mar. 31, 2013 ORM Timber Funds	Mar. 31, 2012 ORM Timber Funds
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Operating term for Fund			10 years	10 years	10 years
Termination agreement date			2017-08	2021-03
Termination agreement description					Fund III terminating on the tenth anniversary of the completion of its drawdown period. Fund III’s drawdown period will end at the earlier of placement of all committed capital or 3 years from the date of its final close, which was on July 31, 2012.
Area of timberland acquired						19,000
Payment to acquire timberland						$ 45,100,000
Deployment of committed capital, percentage						25.00%
Pope Resources and ORMLLC combined ownership percentage			20.00%	20.00%	5.00%
Funds' income (losses) from operation	3,758,000	1,070,000					791,000	12,000
Management fees paid to ORMLLC							$ 673,000	$ 476,000