Debt instrument extension period.

No definition available.

Name:	ari_DebtInstrumentExtensionPeriod
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- Definition

Line of Credit Covenant, Consolidated Recourse Indebtedness

+ References

No definition available.

+ Details

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

- Definition

Line of Credit, Covenant, Maximum Debt to Tangible Net Worth Ratio

+ References

No definition available.

+ Details

Name:	ari_LineofCreditCovenantMaximumDebttoTangibleNetWorthRatio
Namespace Prefix:	ari_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Covenant, Minimum EBITDA to Interest Expense Ratio

+ References

No definition available.

+ Details

Name:	ari_LineofCreditCovenantMinimumEBITDAtoInterestExpenseRatio
Namespace Prefix:	ari_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Covenant, Minimum Liquidity

+ References

No definition available.

+ Details

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

- Definition

Line of Credit Covenant, Minimum Liquidity Percentage

+ References

No definition available.

+ Details

Name:	ari_LineofCreditCovenantMinimumLiquidityPercentage
Namespace Prefix:	ari_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit, Covenant, Minimum Net Asset Value

+ References

No definition available.

+ Details

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

- Definition

Line of Credit Covenant, Minimum Net Asset Value Percentage During Prior Quarter

+ References

No definition available.

+ Details

Name:	ari_LineofCreditCovenantMinimumNetAssetValuePercentageDuringPriorQuarter
Namespace Prefix:	ari_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Covenant, Minimum Net Asset Value Percentage During Prior Year

+ References

No definition available.

+ Details

Name:	ari_LineofCreditCovenantMinimumNetAssetValuePercentageDuringPriorYear
Namespace Prefix:	ari_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit, Covenant, Minimum Shareholder's Equity of Gross Capital Proceeds

+ References

No definition available.

+ Details

Name:	ari_LineofCreditCovenantMinimumShareholdersEquityofGrossCapitalProceeds
Namespace Prefix:	ari_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Borrowing Margin Ratio

+ References

No definition available.

+ Details

Name:	ari_LineofCreditFacilityBorrowingMarginRatio
Namespace Prefix:	ari_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Covenant Terms, Minimum Consolidated Tangible Net Worth Covenant, Amount

+ References

No definition available.

+ Details

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

- Definition

Line of Credit Facility, Covenant Terms, Minimum Consolidated Tangible Net Worth Covenant, Percentage of Additional Net Cash Proceeds

+ References

No definition available.

+ Details

Name:	ari_LineofCreditFacilityCovenantTermsMinimumConsolidatedTangibleNetWorthCovenantPercentageofAdditionalNetCashProceeds
Namespace Prefix:	ari_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Covenant Terms, Minimum Net Income During Four Consecutive Quarters

+ References

No definition available.

+ Details

Name:	ari_LineofCreditFacilityCovenantTermsMinimumNetIncomeDuringFourConsecutiveQuarters
Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line of Credit Facility, Covenant Terms, Total Recourse Indebtedness, Amount

+ References

No definition available.

+ Details

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

- Definition

Line of Credit Facility, Covenant Terms, Total Recourse Indebtedness, Percent

+ References

No definition available.

+ Details

Name:	ari_LineofCreditFacilityCovenantTermsTotalRecourseIndebtednessPercent
Namespace Prefix:	ari_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Estimated Fair Value of Collateral Pledged Percentage

+ References

No definition available.

+ Details

Name:	ari_LineofCreditFacilityEstimatedFairValueofCollateralPledgedPercentage
Namespace Prefix:	ari_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Margin of Cash Borrowed, Percentage

+ References

No definition available.

+ Details

Name:	ari_LineofCreditFacilityMarginofCashBorrowedPercentage
Namespace Prefix:	ari_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Period of Potential Extension

+ References

No definition available.

+ Details

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

- Definition

Line of Credit Facility, Threshold Amount for Margin Calls

+ References

No definition available.

+ Details

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

- Definition

Line of Credit, Limited Guarantee Percentage Credit Facility

+ References

No definition available.

+ Details

Name:	ari_LineofCreditLimitedGuaranteePercentageCreditFacility
Namespace Prefix:	ari_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Subsidiaries, Covenant Terms

+ References

No definition available.

+ Details

Name:	ari_NumberofSubsidiariesCovenantTerms
Namespace Prefix:	ari_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

+ Details

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

- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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- Details

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- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ari_GoldmanSachsMember
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- Details

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- Details

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Period Type:

- Details

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- Details

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Period Type:

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Borrowings - Additional Information (Details)			1 Months Ended				12 Months Ended
Borrowings - Additional Information (Details)	Jan. 26, 2015 USD ($)	Jan. 08, 2015	Apr. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Aug. 31, 2010 USD ($)	Jan. 31, 2010 subsidiary	Dec. 31, 2015 USD ($)	Dec. 31, 2014
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on interest rate							4.40%
Line of Credit [Member]
Debt Instrument [Line Items]
Expiration period							2 years 8 months 12 days	3 years 2 months 12 days
Line of Credit [Member] \| Wells Fargo [Member]
Debt Instrument [Line Items]
Basis spread on interest rate								0.80%
Expiration period								2 months 12 days
Line of Credit [Member] \| UBS [Member]
Debt Instrument [Line Items]
Maximum borrowing under facility				$ 133,899,000
Estimated fair value of collateral pledged, percentage				100.00%
Covenant terms, minimum net asset value				$ 500,000,000
Covenant terms, maximum debt to tangible net worth ratio				3
Expiration period				4 years			2 years 8 months 12 days	3 years 8 months 12 days
Length of potential extension				1 year
Margin of cash borrowed, percentage				22.50%
Line of Credit [Member] \| UBS [Member] \| Six Month LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on interest rate				1.55%
Line of Credit [Member] \| JP Morgan Chase [Member]
Debt Instrument [Line Items]
Expiration period							3 years 1 month 6 days	1 month 6 days
Line of Credit [Member] \| Goldman Sachs [Member]
Debt Instrument [Line Items]
Expiration period							3 years 3 months 18 days
Line of Credit [Member] \| Goldman Sachs [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on interest rate							3.50%	3.50%
Line of Credit [Member] \| Minimum [Member] \| JP Morgan Chase [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on interest rate							2.25%	2.25%
Line of Credit [Member] \| Maximum [Member] \| JP Morgan Chase [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on interest rate							4.75%	4.75%
Wells Facility [Member] \| Line of Credit [Member] \| Wells Fargo [Member]
Debt Instrument [Line Items]
Basis spread on interest rate					1.50%
Estimated fair value of collateral pledged, percentage		95.00%
Threshold amount for margin calls					$ 250,000
Covenant terms, minimum net asset value					$ 100,000,000
Covenant terms, minimum net asset value percentage, during prior quarter					75.00%
Covenant terms, minimum net asset value percentage, during prior year					65.00%
Covenant terms, maximum debt to tangible net worth ratio					8
Covenant terms, minimum liquidity					$ 2,500,000
Covenant terms, minimum EBITDA to interest expense ratio					1.5
Limited guarantee percentage credit facility					15.00%
Covenant terms, total recourse indebtedness, percent					10.00%
Covenant terms, total recourse indebtedness, amount					$ 12,500,000
Wells Facility [Member] \| Line of Credit [Member] \| Wells Fargo [Member] \| Financial Guarantee [Member]
Debt Instrument [Line Items]
Maximum guarantee obligations					$ 37,500,000
Wells Facility [Member] \| Line of Credit [Member] \| Wells Fargo [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on interest rate					0.80%
Wells Facility [Member] \| Line of Credit [Member] \| Minimum [Member] \| Wells Fargo [Member]
Debt Instrument [Line Items]
Estimated fair value of collateral pledged, percentage					85.00%
Wells Facility [Member] \| Line of Credit [Member] \| Maximum [Member] \| Wells Fargo [Member]
Debt Instrument [Line Items]
Estimated fair value of collateral pledged, percentage					90.00%
DB Facility [Member] \| Line of Credit [Member] \| Deutsche Bank AG [Member]
Debt Instrument [Line Items]
Maximum borrowing under facility			$ 300,005,000
Covenant terms, minimum shareholder's equity of gross capital proceeds							50.00%
DB Facility [Member] \| Line of Credit [Member] \| Minimum [Member] \| Deutsche Bank AG [Member]
Debt Instrument [Line Items]
Borrowing margin ratio			125.00%
DB Facility [Member] \| Line of Credit [Member] \| Minimum [Member] \| Deutsche Bank AG [Member] \| Three Month LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on interest rate			1.80%
DB Facility [Member] \| Line of Credit [Member] \| Maximum [Member] \| Deutsche Bank AG [Member]
Debt Instrument [Line Items]
Borrowing margin ratio			181.82%
DB Facility [Member] \| Line of Credit [Member] \| Maximum [Member] \| Deutsche Bank AG [Member] \| Three Month LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on interest rate			2.32%
JP Morgan Facility [Member] \| Line of Credit [Member] \| JP Morgan Chase [Member]
Debt Instrument [Line Items]
Number of subsidiaries \| subsidiary						2
Amended and Restated JPMorgan Facility [Member] \| Line of Credit [Member] \| JP Morgan Chase [Member]
Debt Instrument [Line Items]
Maximum borrowing under facility							$ 600,000,000
Threshold amount for margin calls							$ 250
Covenant terms, maximum debt to tangible net worth ratio							3
Term of debt instrument							3 years
Extension option							1 year
Covenant terms, minimum consolidated tangible net worth							$ 750,000,000
Covenant terms, minimum consolidated tangible net worth, additional percentage of net cash proceeds							75.00%
Covenant terms, minimum liquidity percentage							5.00%
Covenant terms, consolidated recourse indebtedness							$ 15,000,000
Amended and Restated JPMorgan Facility [Member] \| Line of Credit [Member] \| Minimum [Member] \| JP Morgan Chase [Member]
Debt Instrument [Line Items]
Estimated fair value of collateral pledged, percentage							25.00%
Amended and Restated JPMorgan Facility [Member] \| Line of Credit [Member] \| Minimum [Member] \| JP Morgan Chase [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on interest rate							2.25%
Amended and Restated JPMorgan Facility [Member] \| Line of Credit [Member] \| Maximum [Member] \| JP Morgan Chase [Member]
Debt Instrument [Line Items]
Estimated fair value of collateral pledged, percentage							80.00%
Amended and Restated JPMorgan Facility [Member] \| Line of Credit [Member] \| Maximum [Member] \| JP Morgan Chase [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on interest rate							4.75%
Goldman Facility [Member] \| Line of Credit [Member] \| Goldman Sachs [Member]
Debt Instrument [Line Items]
Maximum borrowing under facility	$ 52,524,000
Covenant terms, maximum debt to tangible net worth ratio	3
Covenant terms, minimum liquidity	$ 15,000,000
Covenant terms, minimum EBITDA to interest expense ratio	1.5
Covenant terms, total recourse indebtedness, percent	5.00%
Covenant terms, minimum consolidated tangible net worth	$ 750,000,000
Covenant terms, minimum net income	$ 1
Goldman Facility [Member] \| Line of Credit [Member] \| Goldman Sachs [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on interest rate	3.50%