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Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligation (Detail) - Defined Benefit Pension Plan [Member]
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Weighted Average Assumptions Used to Determine Benefit Obligation    
Discount rate used for disclosure 4.25% 4.00%
Expected return on plan assets 7.50% 7.50%
Rate of compensation increase 3.00% 3.00%