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Commitments and Contingencies - 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 ($) | Sep. 30, 2014 KBCD Partnership [Member] USD ($) | Sep. 30, 2014 KBCD Partnership [Member] EUR (€) | Sep. 30, 2013 KBCD Partnership [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] |  |  |  |  |  |  |  |
Commitment to invest |  |  |  |  |  |  | $ 50,000 us-gaap_OtherCommitment / us-gaap_OtherCommitmentsAxis = ari_CommitmenttoInvestinKBCDMember | € 38,000 us-gaap_OtherCommitment / us-gaap_OtherCommitmentsAxis = ari_CommitmenttoInvestinKBCDMember
Indirect ownership interest from limited partnership |  |  |  | 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 |  |
Initial funding for equity method investment | $ 39,477 us-gaap_PaymentsToAcquireEquityMethodInvestments | $ 0 us-gaap_PaymentsToAcquireEquityMethodInvestments | $ 0 us-gaap_PaymentsToAcquireEquityMethodInvestments | $ 39,477 us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ari_KBCDPartnershipMember | € 30,724 us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ari_KBCDPartnershipMember |  |  |

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- 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 + Details
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- 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. + Details
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- 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 + Details
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- Details
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