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Share-Based Payments - Summary of Grants, Exchanges and Forfeitures of Restricted Stock and RSUs (Detail) - LTIP [Member]
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
shares
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding, beginning of period (in shares) 150,110,000
Outstanding, end of period (in shares) 154,459,000
RSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding, beginning of period (in shares) 1,703,775,000
Vested (in shares) (334,320)
Outstanding, end of period (in shares) 1,367,484,000
January 2017 [Member] | Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Vested (in shares) (5,161,000)
January 2017 [Member] | RSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Cancelled upon delivery (in shares) (332,349,000)
March 2017 [Member] | RSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Forfeiture (in shares) (1,971,000)
April 2017 [Member] | Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Vested (in shares) (5,164,000)
Grant (in shares) 14,674,000
Estimated fair value on grant date | $ $ 275
May 2017 [Member] | RSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Cancelled upon delivery (in shares) (1,971,000)