Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 6,984	$ (60,202)	$ 6,633	$ (183,372)
Other comprehensive income
Unrealized gain (loss) on foreign currency translation	145,481	3,668	206,382	(42,064)
Realized and unrealized (loss) gain on derivative financial instruments	(143,268)	(3,210)	(203,663)	42,938
Unrealized loss on derivative financial instruments from unconsolidated entities	(1,006)	0	(1,189)	0
Other comprehensive income	1,207	458	1,530	874
Comprehensive income (loss)	8,191	(59,744)	8,163	(182,498)
Comprehensive income attributable to non-controlling interests	(15)	(855)	(21)	(1,523)
Comprehensive income (loss) attributable to Blackstone Mortgage Trust, Inc.	$ 8,176	$ (60,599)	$ 8,142	$ (184,021)