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Share-Based Payments - Summary of Restricted Stock and RSU Vesting Dates (Detail) - LTIP [Member]	Mar. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,514,404,000
April 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	5,164,000
June 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	544,000
July 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	4,004,000
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	657,112,000
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	2,755,000
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	525,736,000
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	1,424,000
December 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	306,112,000
Shares Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	144,949,000
Shares Vesting [Member] | April 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	5,164,000
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	4,004,000
Shares Vesting [Member] | October 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	3,997,000
Shares Vesting [Member] | December 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	53,923,000
Shares Vesting [Member] | January 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,749,000
Shares Vesting [Member] | April 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	2,755,000
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	1,420,000
Shares Vesting [Member] | October 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,424,000
Shares Vesting [Member] | December 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	41,670,000
Shares Vesting [Member] | January 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,419,000
Shares Vesting [Member] | April 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,424,000
Shares Vesting [Member] | December 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	25,000,000
RSU Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vesting	1,369,455,000
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	544,000
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	603,189,000
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	484,066,000
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	281,112,000

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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.

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- Definition

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+ References

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