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Share-Based Payments - Summary of Restricted Stock and RSU Vesting Dates (Details) (LTIP [Member])	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	540,771ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest
January 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,698ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JanuaryTwoThousandFifteenMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
March 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	6,667ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_MarchTwoThousandFifteenMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
April 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,699ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_AprilTwoThousandFifteenMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
July 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,300ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JulyTwoThousandFifteenMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
July 2015 (2) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	250ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_July20152Member / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
October 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,300ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_OctoberTwoThousandFifteenMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
December 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	212,340ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_DecemberTwoThousandFifteenMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
January 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,299ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JanuaryTwoThousandSixteenMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
April 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,300ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_AprilTwoThousandSixteenMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
July 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,828ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JulyTwoThousandSixteenMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
October 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,827ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_OctoberTwoThousandSixteenMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
December 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	145,672ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_DecemberTwoThousandSixteenMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
January 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,411ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JanuaryTwoThousandSeventeenMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
April 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,414ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_AprilTwoThousandSeventeenMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
July 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,250ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_July2017Member / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
October 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,250ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_October2017Member / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
December 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	142,266ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_December2017Member / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	73,927ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | January 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,698ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JanuaryTwoThousandFifteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | March 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_MarchTwoThousandFifteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | April 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,699ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_AprilTwoThousandFifteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | July 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,300ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JulyTwoThousandFifteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | July 2015 (2) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	250ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_July20152Member / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | October 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,300ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_OctoberTwoThousandFifteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | December 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	15,588ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_DecemberTwoThousandFifteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | January 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,299ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JanuaryTwoThousandSixteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | April 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,300ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_AprilTwoThousandSixteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | July 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,828ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JulyTwoThousandSixteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | October 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,827ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_OctoberTwoThousandSixteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | December 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	12,255ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_DecemberTwoThousandSixteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | January 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,411ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JanuaryTwoThousandSeventeenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | April 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,414ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_AprilTwoThousandSeventeenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | July 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,250ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_July2017Member / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | October 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,250ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_October2017Member / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
Shares Vesting [Member] | December 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	12,258ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_December2017Member / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	466,844ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | January 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JanuaryTwoThousandFifteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | March 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	6,667ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_MarchTwoThousandFifteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | April 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_AprilTwoThousandFifteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | July 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JulyTwoThousandFifteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | July 2015 (2) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_July20152Member / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | October 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_OctoberTwoThousandFifteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | December 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	196,752ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_DecemberTwoThousandFifteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | January 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JanuaryTwoThousandSixteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | April 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_AprilTwoThousandSixteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | July 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JulyTwoThousandSixteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | October 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_OctoberTwoThousandSixteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | December 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	133,417ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_DecemberTwoThousandSixteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | January 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_JanuaryTwoThousandSeventeenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | April 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_AprilTwoThousandSeventeenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | July 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_July2017Member / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | October 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_October2017Member / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember
RSU Vesting [Member] | December 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	130,008ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest / us-gaap_AwardDateAxis = ari_December2017Member / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ari_A2009EquityIncentivePlanLTIPMember

X

- Definition

Share based compensation arrangement by share based payment award equity instruments other than options expected to vest.

+ References

No definition available.

+ Details

Name:	ari_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVest
Namespace Prefix:	ari_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

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