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Benefit Plans - Schedule of Pension Plan's Weighted-Average Asset Allocations (Detail)
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Total 100.00% 100.00%
Fixed Income Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total   40.00%
Equity Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total   60.00%
Cash and Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total 100.00%