Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (3,875,164)	$ (6,341,069)	$ (12,635,135)	$ (21,579,230)
Other comprehensive income (loss):
Foreign currency translation adjustment	3,083,732	(437,719)	4,446,136	1,269,877
Foreign currency forward contract gains (losses)	(3,087,699)	461,866	(4,546,081)	(673,376)
Interest rate swap and cap contract gains (losses)	156,426	141,541	74,362	(258,118)
Other comprehensive income (loss)	152,459	165,688	(25,583)	338,383
Comprehensive loss	(3,722,705)	(6,175,381)	(12,660,718)	(21,240,847)
Comprehensive loss attributable to noncontrolling interests:
Comprehensive loss attributable to the noncontrolling interests in our Operating Partnership	33,036	2,642	100,789	11,363
Comprehensive loss attributable to Strategic Storage Trust II, Inc. common stockholders	$ (3,689,669)	$ (6,172,739)	$ (12,559,929)	$ (21,229,484)