Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Tour revenues	$ 82,410	$ 63,128
Tour revenues, Change	$ 19,282
Tour revenues, %	31.00%
Operating income:	$ 14,371	1,365
Operating income, Change	$ 13,006
Operating income, %
Lindblad [Member]
Segment Reporting Information [Line Items]
Tour revenues	$ 70,453	53,202
Tour revenues, Change	$ 17,251
Tour revenues, %	32.00%
Operating income:	$ 13,439	1,266
Operating income, Change	$ 12,173
Operating income, %
Natural Habitat [Member]
Segment Reporting Information [Line Items]
Tour revenues	$ 11,957	9,926
Tour revenues, Change	$ 2,031
Tour revenues, %	20.00%
Operating income:	$ 932	$ 99
Operating income, Change	$ 833
Operating income, %