XML 95 R86.htm IDEA: XBRL DOCUMENT v3.8.0.1
Pension Plans and Defined Contribution Plan - Schedule of Estimated Future Benefit Payments (Detail) - Pension Plans [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 12,739
2019 11,798
2020 11,175
2021 10,145
2022 10,838
2023-2027 $ 55,673