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Benefit Plans - Schedule of Pension Plan's Weighted-Average Asset Allocations (Detail)
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Total 100.00% 100.00%
Fixed Income Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total 40.00% 39.00%
Equity Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total 60.00% 61.00%