Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (60,202)	$ 102,497	$ (183,372)	$ 221,053
Other comprehensive income
Unrealized gain (loss) on foreign currency translation	3,668	28,469	(42,064)	50,328
Realized and unrealized (loss) gain on derivative financial instruments	(3,210)	(25,557)	42,938	(49,609)
Other comprehensive income	458	2,912	874	719
Comprehensive (loss) income	(59,744)	105,409	(182,498)	221,772
Comprehensive income attributable to non-controlling interests	(855)	(846)	(1,523)	(1,645)
Comprehensive (loss) income attributable to Blackstone Mortgage Trust, Inc.	$ (60,599)	$ 104,563	$ (184,021)	$ 220,127