Name:	ari_AllowanceForLoanAndLeaseLossesIncludingLoanSpecificRealEstateAndOffBalanceSheetCreditLossExpenseReversal
Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Allowance For Loan And Lease Losses, Including Loan Specific, Real Estate And Off-Balance Sheet, Credit Loss, Liability

No definition available.

Name:	ari_AllowanceForLoanAndLeaseLossesIncludingLoanSpecificRealEstateAndOffBalanceSheetCreditLossLiability
Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Allowance For Loan And Lease Losses, Including Loan Specific, Real Estate And Off-Balance Sheet, Credit Loss, Liability, Percent Of Amortized Cost

No definition available.

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

Allowance For Loan And Lease Losses, Real Estate And Off-Balance Sheet, Credit Loss, Expense (Reversal)

No definition available.

Name:	ari_AllowanceForLoanAndLeaseLossesRealEstateAndOffBalanceSheetCreditLossExpenseReversal
Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Allowance For Loan And Lease Losses, Real Estate And Off-Balance Sheet, Credit Loss, Liability

No definition available.

Name:	ari_AllowanceForLoanAndLeaseLossesRealEstateAndOffBalanceSheetCreditLossLiability
Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Allowance For Loan And Lease Losses, Real Estate And Off-Balance Sheet, Credit Loss, Liability, Percent Of Amortized Cost

No definition available.

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

Financing Receivable, Funded, Allowance for Credit Loss

No definition available.

Name:	ari_FinancingReceivableFundedAllowanceforCreditLoss
Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]

No definition available.

Name:	ari_FinancingReceivableFundedAllowanceforCreditLossRollForward
Namespace Prefix:	ari_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Financing Receivable, Funded, Credit Loss, Expense (Reversal)

No definition available.

Name:	ari_FinancingReceivableFundedCreditLossExpenseReversal
Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]

No definition available.

Name:	ari_FinancingReceivableGeneralAllowanceAllowanceforCreditLossRollForward
Namespace Prefix:	ari_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Financing Receivable, Total Allowance for Credit Loss [Roll Forward]

No definition available.

Name:	ari_FinancingReceivableTotalAllowanceforCreditLossRollForward
Namespace Prefix:	ari_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]

No definition available.

Name:	ari_FinancingReceivableUnfundedAllowanceforCreditLossRollForward
Namespace Prefix:	ari_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446

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

Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.