Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Net income	$ 100,263	$ 80,540
Other comprehensive (loss) income
Unrealized loss on foreign currency translation	(45,222)	(34,957)
Realized and unrealized gain on derivative financial instruments	45,514	35,071
Other comprehensive income	292	114
Comprehensive income	100,555	80,654
Comprehensive income attributable to non-controlling interests	(576)	(638)
Comprehensive income attributable to Blackstone Mortgage Trust, Inc.	$ 99,979	$ 80,016