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Share-Based Payments - Summary of Restricted Stock and RSU Vesting Dates (Detail) - LTIP [Member]	Jun. 30, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,057,650
July 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	6,120
October 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	5,578
December 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	370,452
January 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	52,189
April 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	5,164
June 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	544
July 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	4,004
October 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,997
December 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	367,056
January 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,749
April 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,755
June 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	544
July 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,420
October 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,424
December 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	230,811
January 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,419
April 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,424
Shares Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	115,185
Shares Vesting [Member] | July 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	5,577
Shares Vesting [Member] | October 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	5,578
Shares Vesting [Member] | December 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	28,920
Shares Vesting [Member] | January 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	5,161
Shares Vesting [Member] | April 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	5,164
Shares Vesting [Member] | June 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0
Shares Vesting [Member] | July 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	4,004
Shares Vesting [Member] | October 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,997
Shares Vesting [Member] | December 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	28,923
Shares Vesting [Member] | January 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,749
Shares Vesting [Member] | April 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,755
Shares Vesting [Member] | June 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0
Shares Vesting [Member] | July 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,420
Shares Vesting [Member] | October 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,424
Shares Vesting [Member] | December 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	16,670
Shares Vesting [Member] | January 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,419
Shares Vesting [Member] | April 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,424
RSU Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	942,465
RSU Vesting [Member] | July 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	543
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	341,532
RSU Vesting [Member] | January 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	47,028
RSU Vesting [Member] | April 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0
RSU Vesting [Member] | June 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	544
RSU Vesting [Member] | July 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0
RSU Vesting [Member] | October 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0
RSU Vesting [Member] | December 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	338,133
RSU Vesting [Member] | January 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0
RSU Vesting [Member] | April 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0
RSU Vesting [Member] | June 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	544
RSU Vesting [Member] | July 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0
RSU Vesting [Member] | October 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0
RSU Vesting [Member] | December 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	214,141
RSU Vesting [Member] | January 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0
RSU Vesting [Member] | April 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0

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- Definition

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+ References

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- Definition

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+ References

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