XML 92 R77.htm IDEA: XBRL DOCUMENT v3.8.0.1
Future Retirement Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 422
2019 407
2020 392
2021 393
2022 435
2023 through 2027 $ 1,944