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Unconsolidated Joint Venture - Additional Information (Details) In Thousands, unless otherwise specified	12 Months Ended				9 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Sep. 30, 2014 Champ Limited Partnership [Member]	Sep. 30, 2014 KBCD Partnership [Member] USD ($)	Sep. 30, 2014 KBCD Partnership [Member] EUR (€)	Sep. 30, 2013 KBCD Partnership [Member]	Sep. 30, 2014 Wholly-owned subsidiary [Member] Champ Limited Partnership [Member]	Sep. 30, 2014 Champ LP [Member] KBC Bank Deutschland AG [Member]	Sep. 30, 2013 Commitment to Invest in KBCD [Member] USD ($)	Sep. 30, 2013 Commitment to Invest in KBCD [Member] EUR (€)
Schedule of Equity Method Investments [Line Items]
Ownership interest (percentage)					21.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ari_KBCDPartnershipMember	21.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ari_KBCDPartnershipMember	21.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ari_KBCDPartnershipMember	59.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ari_ChampLimitedPartnershipMember	35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = ari_ChampLPMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ari_KBCBankDeutschlandAGMember
Initial funding for equity method investment	$ 39,477us-gaap_PaymentsToAcquireEquityMethodInvestments	$ 0us-gaap_PaymentsToAcquireEquityMethodInvestments	$ 0us-gaap_PaymentsToAcquireEquityMethodInvestments		$ 39,477us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ari_KBCDPartnershipMember	€ 30,724us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ari_KBCDPartnershipMember
Commitment to invest										$ 50,000us-gaap_OtherCommitment / us-gaap_OtherCommitmentsAxis = ari_CommitmenttoInvestinKBCDMember	€ 38,000us-gaap_OtherCommitment / us-gaap_OtherCommitmentsAxis = ari_CommitmenttoInvestinKBCDMember
Company and affiliated investors ownership, percentage				100.00%ari_OwnershipPercentagebyParentandRelatedParties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ari_ChampLimitedPartnershipMember					100.00%ari_OwnershipPercentagebyParentandRelatedParties / dei_LegalEntityAxis = ari_ChampLPMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ari_KBCBankDeutschlandAGMember

X

- Definition

Ownership Percentage by Parent and Related Parties

+ References

No definition available.

+ Details

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Namespace Prefix:	ari_
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X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

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X

- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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