Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (201,833)	$ 249,897	$ 251,057
Other comprehensive (loss) income
Unrealized (loss) gain on foreign currency translation	(89,460)	75,339	(171,652)
Realized and unrealized gain (loss) on derivative financial instruments	88,274	(75,907)	173,366
Other comprehensive (loss) income	(1,186)	(568)	1,714
Comprehensive (loss) income	(203,019)	249,329	252,771
Comprehensive income attributable to non-controlling interests	(2,255)	(3,342)	(2,415)
Comprehensive (loss) income attributable to Blackstone Mortgage Trust, Inc.	$ (205,274)	$ 245,987	$ 250,356