Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs (Detail)

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Employee Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Compensation And Retirement Disclosure [Abstract]    
Discount rate 4.21% 3.88%
Rate of compensation increase 3.00% 3.00%