Debt Instrument, Covenant, Interest Coverage Ratio, Maximum

No definition available.

Name:	ari_DebtInstrumentCovenantInterestCoverageRatioMaximum
Namespace Prefix:	ari_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant, Liquidity Ratio Required, Minimum

+ References

No definition available.

+ Details

Name:	ari_DebtInstrumentCovenantLiquidityRatioRequiredMinimum
Namespace Prefix:	ari_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant, Liquidity Required, Minimum, Amount

+ References

No definition available.

+ Details

Name:	ari_DebtInstrumentCovenantLiquidityRequiredMinimumAmount
Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Covenant, Net Cash Proceeds Of Additional Equity Issuances, Amount

+ References

No definition available.

+ Details

Name:	ari_DebtInstrumentCovenantNetCashProceedsOfAdditionalEquityIssuancesAmount
Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Covenant, Tangible Net Worth, Percentage

+ References

No definition available.

+ Details

Name:	ari_DebtInstrumentCovenantTangibleNetWorthPercentage
Namespace Prefix:	ari_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Waiving Of Debt Service Payments, Term

+ References

No definition available.

+ Details

Name:	ari_DebtInstrumentWaivingOfDebtServicePaymentsTerm
Namespace Prefix:	ari_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Weighted Average Haircut Under Repurchase Agreements

+ References

No definition available.

+ Details

Name:	ari_DebtInstrumentWeightedAverageHaircutUnderRepurchaseAgreements
Namespace Prefix:	ari_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Credit Facilities

+ References

No definition available.

+ Details

Name:	ari_NumberOfCreditFacilities
Namespace Prefix:	ari_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(i))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(1))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

+ Details

Name:	us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

+ Details

Name:	us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ari_JPMorganChaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_USD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_EUR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ari_DeutscheBankRepurchaseFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ari_CreditSuisseFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ari_HSBCFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ari_GoldmanSachsRepurchaseFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ari_BarclaysFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ari_MUFGFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ari_SantanderFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ari_BarclaysSecuritizationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ari_AmendedandRestatedJPMorganFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Secured Debt Arrangements, Net - Additional Information (Details) € in Millions, £ in Millions, kr in Billions	9 Months Ended
	Sep. 30, 2022 USD ($) facility	Sep. 30, 2022 SEK (kr) facility	Sep. 30, 2022 GBP (£) facility	Sep. 30, 2022 EUR (€) facility	Dec. 31, 2021 USD ($)	Nov. 30, 2019 USD ($)
Debt Instrument [Line Items]
Number of credit facilities \| facility	2	2	2	2
Weighted average haircut under repurchase agreements	30.50%	30.50%	30.50%	30.50%	30.20%
Net cash proceeds of additional equity issuances, amount	$ 1,250,000,000
Tangible net worth, percentage	75.00%	75.00%	75.00%	75.00%
Maximum interest coverage ratio	375.00%	375.00%	375.00%	375.00%
Recourse, percentage	5.00%	5.00%	5.00%	5.00%
Minimum unrestricted cash	$ 30,000,000
Line of Credit
Debt Instrument [Line Items]
Maximum amount of borrowings	5,993,095,000				$ 4,932,049,000
Balance	5,364,119,000				4,159,330,000
Secured debt arrangements, net (net of deferred financing costs of $13,533 and $9,062 in 2022 and 2021, respectively)	5,350,586,000				4,150,268,000
Line of Credit \| JP Morgan Facility
Debt Instrument [Line Items]
Balance	1,493,201,000				1,484,992,000
Line of Credit \| JP Morgan Facility \| USD
Debt Instrument [Line Items]
Maximum amount of borrowings	1,533,896,000				1,344,283,000
Secured debt arrangements, net (net of deferred financing costs of $13,533 and $9,062 in 2022 and 2021, respectively)	1,427,097,000				1,329,923,000
Line of Credit \| JP Morgan Facility \| Fx contracts - EUR
Debt Instrument [Line Items]
Maximum amount of borrowings	0				68,220,000
Secured debt arrangements, net (net of deferred financing costs of $13,533 and $9,062 in 2022 and 2021, respectively)	0				68,220,000
Line of Credit \| DB Repurchase Facility
Debt Instrument [Line Items]
Balance	432,269,000				259,073,000
Line of Credit \| DB Repurchase Facility \| USD
Debt Instrument [Line Items]
Maximum amount of borrowings	700,000,000				700,000,000
Secured debt arrangements, net (net of deferred financing costs of $13,533 and $9,062 in 2022 and 2021, respectively)	432,269,000				259,073,000
Line of Credit \| Credit Suisse Facility \| USD
Debt Instrument [Line Items]
Maximum amount of borrowings	633,798,000				161,609,000
Balance	629,026,000				148,720,000
Secured debt arrangements, net (net of deferred financing costs of $13,533 and $9,062 in 2022 and 2021, respectively)	629,026,000				148,720,000
Line of Credit \| HSBC Facility \| Fx contracts - EUR
Debt Instrument [Line Items]
Maximum amount of borrowings	255,623,000				167,756,000
Balance	592,510,000				162,937,000
Secured debt arrangements, net (net of deferred financing costs of $13,533 and $9,062 in 2022 and 2021, respectively)	255,623,000				162,937,000
Line of Credit \| Goldman Sachs Repurchase Facility
Debt Instrument [Line Items]
Balance	148,334,000				168,231,000
Line of Credit \| Goldman Sachs Repurchase Facility \| USD
Debt Instrument [Line Items]
Maximum amount of borrowings	300,000,000				300,000,000
Secured debt arrangements, net (net of deferred financing costs of $13,533 and $9,062 in 2022 and 2021, respectively)	148,334,000				168,231,000
Line of Credit \| Barclays Facility \| USD
Debt Instrument [Line Items]
Maximum amount of borrowings	200,000,000				200,000,000
Balance	125,592,000				32,693,000
Secured debt arrangements, net (net of deferred financing costs of $13,533 and $9,062 in 2022 and 2021, respectively)	125,592,000				32,693,000
Line of Credit \| MUFG Facility \| USD
Debt Instrument [Line Items]
Balance	179,592,000
Line of Credit \| Santander Facility \| Fx contracts - EUR
Debt Instrument [Line Items]
Maximum amount of borrowings	52,931,000				0
Balance	48,426,000
Secured debt arrangements, net (net of deferred financing costs of $13,533 and $9,062 in 2022 and 2021, respectively)	48,426,000				0
Line of Credit \| Barclays Securitization
Debt Instrument [Line Items]
Balance	1,715,169,000				1,902,684,000
Secured debt arrangements, net (net of deferred financing costs of $13,533 and $9,062 in 2022 and 2021, respectively)		kr 2.1	£ 936.9	€ 491.8
Line of Credit \| Barclays Securitization \| VIE
Debt Instrument [Line Items]
Maximum amount of borrowings	1,734,264,000				1,902,684,000
Balance	2,321,888,000,000				2,587,049,000,000
Secured debt arrangements, net (net of deferred financing costs of $13,533 and $9,062 in 2022 and 2021, respectively)	$ 1,715,169,000				1,902,684,000
Deferring or waiving debt service payments, term	18 months
Line of Credit \| Barclays Securitization \| Fx contracts - EUR \| VIE
Debt Instrument [Line Items]
Balance	$ 690,087,000,000				$ 533,164,000,000
Line of Credit \| Amended and Restated JPMorgan Facility \| JP Morgan Facility
Debt Instrument [Line Items]
Maximum amount of borrowings						$ 1,600,000,000