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Employee Benefit Plans - Additional Information (Detail)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
shares
Pension Benefits  
Compensation and Retirement Disclosure [Abstract]  
Employer contribution to tax-qualified defined benefit pension plans | $ $ 80
Minimum  
Compensation and Retirement Disclosure [Abstract]  
Percentage of pre-tax earnings paid for profit sharing plan 5.00%
Maximum  
Compensation and Retirement Disclosure [Abstract]  
Percentage of pre-tax earnings paid for profit sharing plan 20.00%
RSUs  
Compensation and Retirement Disclosure [Abstract]  
Share-based compensation, other than options, awards granted | shares 1.4
Share-based compensation, vesting period 3 years
Performance Shares  
Compensation and Retirement Disclosure [Abstract]  
Share-based compensation, vesting period 3 years
Share-Based Compensation, vesting date Dec. 31, 2019
Number of days used to compute performance period average closing price of restricted stock units 20 days