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Pension Plan - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Participants
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Compensation and Retirement Disclosure [Abstract]            
Contributions to the plan       $ 500,000   $ 250,000
Recognized pension expense, before income tax   $ 2,909,000        
Benefits paid out of pension plan assets to plan participants   $ 10,626,000        
Percentage of benefits paid of total outstanding obligation balance to plan participants   43.00%       43.00%
Number of participants reduced | Participants   335        
Number of participants reduced percentage   44.00%       44.00%
Net periodic benefit costs, total $ 83,000   $ 107,000 $ 232,000 $ 321,000