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Pension and Employee Benefit Plans - Details of Defined Benefit Pension Plan Asset Allocation by Asset Category (Detail)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 100.00%  
Percentage of Plan Assets 100.00% 100.00%
Cash and cash equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 0.00%  
Percentage of Plan Assets 4.00% 25.00%
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 70.00%  
Percentage of Plan Assets 67.00% 52.00%
Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 30.00%  
Percentage of Plan Assets 29.00% 23.00%