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Summary of Restricted Stock and RSU Vesting Dates (Detail) | Dec. 31, 2012
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 226,387
January 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | January 2013
Number of shares vesting | 96,256
March 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | March 2013
Number of shares vesting | 6,666
April 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | April 2013
Number of shares vesting | 3,339
July 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | July 2013
Number of shares vesting | 4,107
October 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | October 2013
Number of shares vesting | 1,605
January 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | January 2014
Number of shares vesting | 94,899
March 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | March 2014
Number of shares vesting | 6,667
April 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | April 2014
Number of shares vesting | 1,985
July 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | July 2014
Number of shares vesting | 2,100
January 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | January 2015
Number of shares vesting | 796
March 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | March 2015
Number of shares vesting | 6,667
April 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | April 2015
Number of shares vesting | 800
July 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | July 2015
Number of shares vesting | 500
Shares Vesting [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 16,802
Shares Vesting [Member] | January 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 2,507
Shares Vesting [Member] | March 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting |
Shares Vesting [Member] | April 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 2,505
Shares Vesting [Member] | July 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 3,273
Shares Vesting [Member] | October 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 1,189
Shares Vesting [Member] | January 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 1,564
Shares Vesting [Member] | March 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting |
Shares Vesting [Member] | April 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 1,568
Shares Vesting [Member] | July 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 2,100
Shares Vesting [Member] | January 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 796
Shares Vesting [Member] | March 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting |
Shares Vesting [Member] | April 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 800
Shares Vesting [Member] | July 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 500
RSU Vesting [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 209,585
RSU Vesting [Member] | January 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 93,749
RSU Vesting [Member] | March 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 6,666
RSU Vesting [Member] | April 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 834
RSU Vesting [Member] | July 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 834
RSU Vesting [Member] | October 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 416
RSU Vesting [Member] | January 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 93,335
RSU Vesting [Member] | March 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 6,667
RSU Vesting [Member] | April 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 417
RSU Vesting [Member] | July 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting |
RSU Vesting [Member] | January 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting |
RSU Vesting [Member] | March 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 6,667
RSU Vesting [Member] | April 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting |
RSU Vesting [Member] | July 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting |

X
- Definition Share based compensation arrangement by share based payment award equity instruments other than options expected to vest. + References No definition available. + Details
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Namespace Prefix: | ari_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Vesting date of restricted stock and restricted stock units. + References No definition available. + Details
Name: | ari_VestingDateOfRestrictedStockAndRestrictedStockUnits
Namespace Prefix: | ari_
Data Type: | xbrli:stringItemType
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