Earnings per Share - Schedule of Basic and Diluted Earning per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income attributable to Claros Mortgage Trust, Inc. common stockholders and redeemable common stockholders		$ 170,537	$ 202,378	$ 168,726
Basic weighted average number of common stock and redeemable common stock outstanding	[1]	134,539,645	132,980,316	111,462,928
Diluted weighted average number of common stock and redeemable common stock outstanding	[1]	134,539,645	132,980,316	111,462,928
Net income per share of common stock and redeemable stock, basic and diluted		$ 1.27	$ 1.52	$ 1.51

[1] Amounts at December 31, 2020 and 2019 include fully vested RSUs, which includes 877,498 common stock underlying vested RSUs