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Stockholders' Equity - Additional Information (Details) (USD $) | 3 Months Ended | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 | May 31, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Jul. 31, 2013
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  |  |  | 450,000,000 us-gaap_CommonStockSharesAuthorized | 450,000,000 us-gaap_CommonStockSharesAuthorized |
Common stock, par value (in dollars per share) |  |  |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |
Preferred stock, shares authorized |  |  |  | 50,000,000 us-gaap_PreferredStockSharesAuthorized | 50,000,000 us-gaap_PreferredStockSharesAuthorized |
Preferred stock, par value (in dollars per share) |  |  |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |
Common stock shares issued |  |  |  | 46,900,442 us-gaap_CommonStockSharesIssued | 36,888,467 us-gaap_CommonStockSharesIssued |
Common stock, shares outstanding |  |  |  | 46,900,442 us-gaap_CommonStockSharesOutstanding | 36,888,467 us-gaap_CommonStockSharesOutstanding |
Preferred stock shares issued |  |  |  | 3,450,000 us-gaap_PreferredStockSharesIssued | 3,450,000 us-gaap_PreferredStockSharesIssued |
Preferred stock, shares outstanding |  |  |  | 3,450,000 us-gaap_PreferredStockSharesOutstanding | 3,450,000 us-gaap_PreferredStockSharesOutstanding |
Proceeds from issuance of common stock, net of offering costs | $ 158,439,000 ari_ProceedsfromIssuanceofCommonStockNetofOfferingCosts |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock offering, authorized amount |  | 100,000,000 ari_StockOfferingProgramAuthorizedAmount / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |
Common Stock [Member] | Follow-on public offering [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of stock, Shares | 9,706,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = ari_FollowOnPublicOfferingMember |  | 8,805,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = ari_FollowOnPublicOfferingMember |  |  |
Price per share of issued stock (in USD per share) | $ 16.35 us-gaap_SharesIssuedPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = ari_FollowOnPublicOfferingMember |  | $ 16.90 us-gaap_SharesIssuedPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = ari_FollowOnPublicOfferingMember |  |  |
Proceeds from issuance of common stock, net of offering costs |  |  | 148,333,000 ari_ProceedsfromIssuanceofCommonStockNetofOfferingCosts / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = ari_FollowOnPublicOfferingMember |  |  |
Common Stock [Member] | July 2013 Repurchase Program [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share Repurchase |  |  |  |  |  | $ 50,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = ari_July2013RepurchaseProgramMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember

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- Definition Face amount or stated value per share of common stock. + 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 210.5-02.29) -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 30 -Article 5 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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 210.5-02.29) -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 30 -Article 5 + Details
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