XML 68 R57.htm IDEA: XBRL DOCUMENT v3.5.0.2
Pension and Employee Benefit Plans - Components of Pension and Employee Benefit Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 112 $ 58 $ 335 $ 175
Interest cost 356 354 1,069 1,060
Expected return on plan assets (457) (502) (1,371) (1,507)
Amortization of net actuarial loss 53 65 159 194
Net periodic benefit cost (gain) 64 (25) 192 (78)
Health Care Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 1 1 3 4
Amortization of loss 3 2 8 5
Net periodic benefit cost (gain) $ 4 $ 3 $ 11 $ 9