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Share-Based Payments Summary of Restricted Stock and RSU Vesting Dates (Detail) (LTIP [Member]) | Dec. 31, 2013
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 268,847
January 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 96,255
March 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 6,667
April 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 3,342
July 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 2,157
July 2014 (2) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 500
October 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 2,153
December 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 70,000
January 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 2,160
March 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 6,667
April 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 2,161
July 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 1,361
July 2015 (2) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 500
October 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 1,361
December 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 70,009
January 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 1,360
April 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 1,361
July 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 417
October 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 416
Shares Vesting [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 35,088
Shares Vesting [Member] | January 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 2,920
Shares Vesting [Member] | March 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 0
Shares Vesting [Member] | April 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 2,925
Shares Vesting [Member] | July 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 2,157
Shares Vesting [Member] | July 2014 (2) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 500
Shares Vesting [Member] | October 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 2,153
Shares Vesting [Member] | December 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 6,668
Shares Vesting [Member] | January 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 2,160
Shares Vesting [Member] | March 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 0
Shares Vesting [Member] | April 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 2,161
Shares Vesting [Member] | July 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 1,361
Shares Vesting [Member] | July 2015 (2) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 500
Shares Vesting [Member] | October 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 1,361
Shares Vesting [Member] | December 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 6,668
Shares Vesting [Member] | January 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 1,360
Shares Vesting [Member] | April 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 1,361
Shares Vesting [Member] | July 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 417
Shares Vesting [Member] | October 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 416
RSU Vesting [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 233,759
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 | 0
RSU Vesting [Member] | July 2014 (2) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 0
RSU Vesting [Member] | October 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 0
RSU Vesting [Member] | December 2014 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 63,332
RSU Vesting [Member] | January 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 0
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 | 0
RSU Vesting [Member] | July 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 0
RSU Vesting [Member] | July 2015 (2) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 0
RSU Vesting [Member] | October 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 0
RSU Vesting [Member] | December 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 63,341
RSU Vesting [Member] | January 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 0
RSU Vesting [Member] | April 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 0
RSU Vesting [Member] | July 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 0
RSU Vesting [Member] | October 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares vesting | 0

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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_
Data Type: | xbrli:sharesItemType
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