Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Net (loss) income	$ (123,170)	$ 118,556
Other comprehensive income (loss)
Unrealized (loss) gain on foreign currency translation	(45,732)	21,858
Realized and unrealized gain (loss) on derivative financial instruments	46,148	(24,052)
Other comprehensive income (loss)	416	(2,194)
Comprehensive (loss) income	(122,754)	116,362
Comprehensive income attributable to non-controlling interests	(668)	(799)
Comprehensive (loss) income attributable to Blackstone Mortgage Trust, Inc.	$ (123,422)	$ 115,563