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Benefit Plans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]        
Gain on reduction of pension obligations       $ 2,208
Defined benefit plan, termination date       2015-10
Defined benefit plan, company contribution       $ 800
Defined Benefit Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Matching contribution by the company to the plan     100.00%  
Percentage of employees' eligible compensation     6.00%  
Expense recognized $ 200 $ 100 $ 700 $ 200