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Share-Based Payments - Summary of Expected Restricted Common Stock and RSU Vesting Dates (Details) | 6 Months Ended
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Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 341,430
July 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | July 2013
Awards Vesting | 4,251
October 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | October 2013
Awards Vesting | 3,341
December 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | December 2013
Awards Vesting | 69,991
January 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | January 2014
Awards Vesting | 95,839
March 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | March 2014
Awards Vesting | 6,667
April 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | April 2014
Awards Vesting | 2,925
July 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | July 2014
Awards Vesting | 2,240
October 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | October 2014
Awards Vesting | 1,736
December 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | December 2014
Awards Vesting | 70,000
January 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | January 2015
Awards Vesting | 1,744
March 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | March 2015
Awards Vesting | 6,667
April 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | April 2015
Awards Vesting | 1,744
July 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | July 2015
Awards Vesting | 1,444
October 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | October 2015
Awards Vesting | 944
December 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | December 2015
Awards Vesting | 70,009
January 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | January 2016
Awards Vesting | 944
April 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | April 2016
Awards Vesting | 944
Shares Vesting [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 43,094
Shares Vesting [Member] | July 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 3,417
Shares Vesting [Member] | October 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 2,925
Shares Vesting [Member] | December 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 6,664
Shares Vesting [Member] | January 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 2,504
Shares Vesting [Member] | March 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting |
Shares Vesting [Member] | April 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 2,508
Shares Vesting [Member] | July 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 2,240
Shares Vesting [Member] | October 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 1,736
Shares Vesting [Member] | December 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 6,668
Shares Vesting [Member] | January 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 1,744
Shares Vesting [Member] | March 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting |
Shares Vesting [Member] | April 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 1,744
Shares Vesting [Member] | July 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 1,444
Shares Vesting [Member] | October 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 944
Shares Vesting [Member] | December 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 6,668
Shares Vesting [Member] | January 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 944
Shares Vesting [Member] | April 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 944
RSU Vesting [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 298,336
RSU Vesting [Member] | July 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 834
RSU Vesting [Member] | October 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 416
RSU Vesting [Member] | December 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 63,327
RSU Vesting [Member] | January 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 93,335
RSU Vesting [Member] | March 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 6,667
RSU Vesting [Member] | April 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 417
RSU Vesting [Member] | July 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting |
RSU Vesting [Member] | October 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 0
RSU Vesting [Member] | December 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 63,332
RSU Vesting [Member] | January 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting |
RSU Vesting [Member] | March 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 6,667
RSU Vesting [Member] | April 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting |
RSU Vesting [Member] | July 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting |
RSU Vesting [Member] | October 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting |
RSU Vesting [Member] | December 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting | 63,341
RSU Vesting [Member] | January 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Vesting |
RSU Vesting [Member] | April 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards 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
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Namespace Prefix: | ari_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration