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Employee Benefit Plans - Changes in Plan Assets and Benefit Obligations in Other Comprehensive Income (loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Benefit Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net actuarial (loss) gain   $ (35) $ (92)
Settlement losses   414 50
Plan amendment and curtailment   0 0
Recognized net actuarial loss   25 20
Amortization of prior service cost   0 0
Recognition of prior service cost due to curtailments   0 0
Total other comprehensive income (loss), pre-tax   404 (22)
Income tax expense (benefit) $ 0 160 (155)
Total other comprehensive income (loss), net of tax 0 244 133
Post-Employment Benefit Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net actuarial (loss) gain 293 (35) (1,632)
Settlement losses 0 0 0
Plan amendment and curtailment 0 0 1,183
Recognized net actuarial loss 269 278 18
Amortization of prior service cost (338) (338) (369)
Recognition of prior service cost due to curtailments 0 0 (52)
Total other comprehensive income (loss), pre-tax 224 (95) (852)
Income tax expense (benefit) 90 (41) (6)
Total other comprehensive income (loss), net of tax $ 134 $ (54) $ (846)