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Share-Based Payments - Summary of Restricted Stock and RSU Vesting Dates (Detail) - LTIP [Member]	Sep. 30, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,522,939,000
October 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,997,000
December 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	657,600,000
January 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,749,000
April 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	7,645,000
June 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	544,000
July 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,420,000
October 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,424,000
December 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	518,843,000
January 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,419,000
April 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	6,314,000
December 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	302,273,000
April 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	4,894,000
August 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	264,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	163,481,000
Restricted Stock [Member] | October 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,997,000
Restricted Stock [Member] | December 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	53,923,000
Restricted Stock [Member] | January 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,749,000
Restricted Stock [Member] | April 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	7,645,000
Restricted Stock [Member] | June 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0
Restricted Stock [Member] | July 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,420,000
Restricted Stock [Member] | October 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,424,000
Restricted Stock [Member] | December 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	41,670,000
Restricted Stock [Member] | January 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,419,000
Restricted Stock [Member] | April 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	6,314,000
Restricted Stock [Member] | December 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	25,000,000
Restricted Stock [Member] | April 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	4,894,000
Restricted Stock [Member] | August 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0
RSU Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,359,457,000
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	603,677,000
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	544,000
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	477,173,000
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
RSU Vesting [Member] | December 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	277,273,000
RSU Vesting [Member] | April 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	0
RSU Vesting [Member] | August 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	264,000

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+ References

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