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Share-Based Payments - Summary of Expected Restricted Common Stock and RSU Vesting Dates (Detail) | Mar. 31, 2013
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 323,465
April 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | April 2013
RSU Vesting | 3,339
July 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | July 2013
RSU Vesting | 4,107
October 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | October 2013
RSU Vesting | 1,605
December 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | December 2013
RSU Vesting | 66,657
January 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | January 2014
RSU Vesting | 94,899
March 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | March 2014
RSU Vesting | 6,667
April 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | April 2014
RSU Vesting | 1,985
July 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | July 2014
RSU Vesting | 2,100
December 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | December 2014
RSU Vesting | 66,667
January 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | January 2015
RSU Vesting | 796
March 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | March 2015
RSU Vesting | 6,667
April 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | April 2015
RSU Vesting | 800
July 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | July 2015
RSU Vesting | 500
December 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting Date | December 2015
RSU Vesting | 66,676
Shares Vesting [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 34,295
Shares Vesting [Member] | April 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 2,505
Shares Vesting [Member] | July 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 3,273
Shares Vesting [Member] | October 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 1,189
Shares Vesting [Member] | December 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 6,664
Shares Vesting [Member] | January 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 1,564
Shares Vesting [Member] | April 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 1,568
Shares Vesting [Member] | July 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 2,100
Shares Vesting [Member] | December 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 6,668
Shares Vesting [Member] | January 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 796
Shares Vesting [Member] | April 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 800
Shares Vesting [Member] | July 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 500
Shares Vesting [Member] | December 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 6,668
RSU Vesting [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 289,170
RSU Vesting [Member] | April 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 834
RSU Vesting [Member] | July 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 834
RSU Vesting [Member] | October 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 416
RSU Vesting [Member] | December 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 59,993
RSU Vesting [Member] | January 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 93,335
RSU Vesting [Member] | March 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 6,667
RSU Vesting [Member] | April 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 417
RSU Vesting [Member] | December 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 59,999
RSU Vesting [Member] | March 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 6,667
RSU Vesting [Member] | December 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
RSU Vesting | 60,008

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- 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_
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Balance Type: | na
Period Type: | instant

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- 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: | instant

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