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Share-Based Payments Summary of Restricted Stock and RSU Vesting Dates (Detail) (LTIP [Member])
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 182,951
October 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 3,313
December 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 73,418
January 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 3,320
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 3,321
July 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 2,522
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 2,522
December 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 73,427
January 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 2,521
April 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 2,522
July 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 1,578
October 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 1,577
December 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 3,418
January 2017 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 1,161
April 2017 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 1,164
Shares Vesting [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 39,357
Shares Vesting [Member] | October 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 3,313
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 3,320
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 3,321
Shares Vesting [Member] | July 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 2,522
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 2,522
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 2,521
Shares Vesting [Member] | April 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 2,522
Shares Vesting [Member] | July 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 1,578
Shares Vesting [Member] | October 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 1,577
Shares Vesting [Member] | December 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 0
Shares Vesting [Member] | January 2017 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 1,161
Shares Vesting [Member] | April 2017 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 1,164
RSU Vesting [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 143,594
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 66,750
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 66,759
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
RSU Vesting [Member] | December 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 3,418
RSU Vesting [Member] | January 2017 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 0
RSU Vesting [Member] | April 2017 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares vesting 0