Segment Reporting Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	$ 18,803	$ 13,178	$ 52,039	$ 36,960
Cost of sales	(11,388)	(6,211)	(31,568)	(20,822)
Operating, general and administrative expenses	(5,654)	(4,982)	(17,536)	(15,059)
Gain on sale of timberland	44	0	12,547	226
Income (loss) from operations	1,805	1,985	15,482	1,305
Fee Timber
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	15,980	11,065	48,234	33,087
Cost of sales	(9,269)	(5,603)	(28,430)	(18,482)
Operating, general and administrative expenses	(2,646)	(2,145)	(7,029)	(6,061)
Gain on sale of timberland	44		12,547	226
Income (loss) from operations	4,109	3,317	25,322	8,770
Fee Timber | Pope Resources
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	8,898	7,834	26,173	20,358
Cost of sales	(3,552)	(3,321)	(10,430)	(8,718)
Operating, general and administrative expenses	(1,538)	(1,510)	(4,151)	(4,248)
Gain on sale of timberland	0		0	0
Income (loss) from operations	3,808	3,003	11,592	7,392
Fee Timber | ORM Timber Funds
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	7,082	3,231	22,061	12,729
Cost of sales	(5,717)	(2,282)	(18,000)	(9,764)
Operating, general and administrative expenses	(1,108)	(635)	(2,878)	(1,813)
Gain on sale of timberland	44		12,547	226
Income (loss) from operations	301	314	13,730	1,378
Timberland Investment Management
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	0	0	0	8
Cost of sales	0	0	0	0
Operating, general and administrative expenses	(679)	(644)	(2,396)	(1,921)
Gain on sale of timberland	0		0	0
Income (loss) from operations	(679)	(644)	(2,396)	(1,913)
Real Estate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	2,823	2,113	3,805	3,865
Cost of sales	(2,119)	(608)	(3,138)	(2,340)
Operating, general and administrative expenses	(1,195)	(1,042)	(3,871)	(3,263)
Gain on sale of timberland	0		0	0
Income (loss) from operations	(491)	463	(3,204)	(1,738)
Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	0	0	0	0
Cost of sales	0	0	0	0
Operating, general and administrative expenses	(1,134)	(1,151)	(4,240)	(3,814)
Gain on sale of timberland	0		0	0
Income (loss) from operations	(1,134)	(1,151)	(4,240)	(3,814)
Internal
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	19,812	14,079	55,116	39,712
Operating, general and administrative expenses	(6,663)	(5,883)	(20,613)	(17,811)
Income (loss) from operations	1,805	1,985	15,482	1,305
Internal | Fee Timber
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	16,063	11,113	48,486	33,235
Operating, general and administrative expenses	(3,513)	(2,947)	(9,658)	(8,531)
Income (loss) from operations	3,325	2,563	22,945	6,448
Internal | Fee Timber | Pope Resources
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	8,981	7,882	26,425	20,506
Operating, general and administrative expenses	(1,576)	(1,546)	(4,286)	(4,343)
Income (loss) from operations	3,853	3,015	11,709	7,445
Internal | Fee Timber | ORM Timber Funds
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	7,082	3,231	22,061	12,729
Operating, general and administrative expenses	(1,937)	(1,401)	(5,372)	(4,188)
Income (loss) from operations	(528)	(452)	11,236	(997)
Internal | Timberland Investment Management
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	829	772	2,494	2,383
Operating, general and administrative expenses	(780)	(708)	(2,705)	(2,114)
Income (loss) from operations	49	64	(211)	269
Internal | Real Estate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	2,920	2,194	4,136	4,094
Operating, general and administrative expenses	(1,213)	(1,052)	(3,929)	(3,293)
Income (loss) from operations	(412)	534	(2,931)	(1,539)
Internal | Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	0	0	0	0
Operating, general and administrative expenses	(1,157)	(1,176)	(4,321)	(3,873)
Income (loss) from operations	(1,157)	(1,176)	(4,321)	(3,873)
Eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	(1,009)	(901)	(3,077)	(2,752)
Operating, general and administrative expenses	1,009	901	3,077	2,752
Income (loss) from operations	0	0	0	0
Eliminations | Fee Timber
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	(83)	(48)	(252)	(148)
Operating, general and administrative expenses	867	802	2,629	2,470
Income (loss) from operations	784	754	2,377	2,322
Eliminations | Fee Timber | Pope Resources
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	(83)	(48)	(252)	(148)
Operating, general and administrative expenses	38	36	135	95
Income (loss) from operations	(45)	(12)	(117)	(53)
Eliminations | Fee Timber | ORM Timber Funds
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	0	0	0	0
Operating, general and administrative expenses	829	766	2,494	2,375
Income (loss) from operations	829	766	2,494	2,375
Eliminations | Timberland Investment Management
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	(829)	(772)	(2,494)	(2,375)
Operating, general and administrative expenses	101	64	309	193
Income (loss) from operations	(728)	(708)	(2,185)	(2,182)
Eliminations | Real Estate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	(97)	(81)	(331)	(229)
Operating, general and administrative expenses	18	10	58	30
Income (loss) from operations	(79)	(71)	(273)	(199)
Eliminations | Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	0	0	0	0
Operating, general and administrative expenses	23	25	81	59
Income (loss) from operations	$ 23	$ 25	$ 81	$ 59