Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Net income	$ 251,057	$ 422,273	$ 140,414
Other comprehensive income (loss)
Unrealized (loss) gain on foreign currency translation	(171,652)	(84,470)	87,113
Realized and unrealized gain (loss) on derivative financial instruments	173,366	81,608	(59,710)
Other comprehensive income (loss)	1,714	(2,862)	27,403
Comprehensive income	252,771	419,411	167,817
Comprehensive income attributable to non-controlling interests	(2,415)	(3,080)	(2,744)
Comprehensive income attributable to Blackstone Mortgage Trust, Inc.	$ 250,356	$ 416,331	$ 165,073