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Employee Benefit Plans - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of pre-tax earnings paid for profit sharing plan     5.00%
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of pre-tax earnings paid for profit sharing plan     20.00%
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of days used to compute performance period average closing price of restricted stock units   20 days  
Share-Based Compensation, award granted   0.3  
Share-Based Compensation, vesting period   3 years  
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation, award granted   0.2  
Share-Based Compensation, vesting period   3 years  
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of days used to compute performance period average closing price of restricted stock units   20 days  
Share-Based Compensation, vesting period   3 years  
Share-Based Compensation, vesting date   Dec. 31, 2017  
Vesting Based On ROIC and Pre-Tax Margin [Member] | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation, award granted   0.6  
Pension Benefits      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employer contribution to tax-qualified defined benefit pension plans $ 620   $ 800