Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 52,342	$ 15,423
Restricted cash	10,096	14,246
Loans receivable, net	2,047,223	141,500
Loans receivable, at fair value	40,665
Investment in CT Legacy Asset, at fair value		132,000
Equity investments in unconsolidated subsidiaries	22,480	13,306
Accrued interest receivable, prepaid expenses, and other assets	39,974	5,868
Total assets	2,212,780	322,343
Liabilities and Equity
Accounts payable, accrued expenses, and other liabilities	56,972	21,209
Secured notes		8,497
Repurchase obligations	1,109,353
Convertible notes, net	159,524
Securitized debt obligations	40,181	139,184
Participations sold	90,000
Total liabilities	1,456,030	168,890
Equity
Common Stock	288	293
Additional paid-in capital	1,252,986	609,002
Accumulated other comprehensive income	798
Accumulated deficit	(536,170)	(535,851)
Total Blackstone Mortgage Trust, Inc. stockholders' equity	717,909	73,444
Non-controlling interests	38,841	80,009
Total equity	756,750	153,453
Total liabilities and equity	2,212,780	322,343
Liabilities
Accounts payable, accrued expenses, and other liabilities	56,972	21,209
Securitized debt obligations	40,181	139,184
Total liabilities	1,456,030	168,890
Restricted Stock [Member]
Equity
Common Stock	7
Variable Interest Entity, Primary Beneficiary [Member]
Assets
Loans receivable, net	47,000	141,500
Accrued interest receivable, prepaid expenses, and other assets	2,836	4,021
Total assets	49,836	145,521
Liabilities and Equity
Accounts payable, accrued expenses, and other liabilities	32	88
Securitized debt obligations	40,181	139,184
Total liabilities	40,213	139,272
Liabilities
Accounts payable, accrued expenses, and other liabilities	32	88
Securitized debt obligations	40,181	139,184
Total liabilities	$ 40,213	$ 139,272