Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Net income	$ 102,497	$ 93,865	$ 221,053	$ 194,128
Other comprehensive income
Unrealized gain (loss) on foreign currency translation	28,469	(130,207)	50,328	(175,429)
Realized and unrealized (loss) gain on derivative financial instruments	(25,557)	128,685	(49,609)	174,199
Other comprehensive income (loss)	2,912	(1,522)	719	(1,230)
Comprehensive income	105,409	92,343	221,772	192,898
Comprehensive income attributable to non-controlling interests	(846)	(615)	(1,645)	(1,191)
Comprehensive income attributable to Blackstone Mortgage Trust, Inc.	$ 104,563	$ 91,728	$ 220,127	$ 191,707