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Commitments, Contingencies and Legal Proceedings - Summary of Minimum Annual Payment Due on Noncancelable Operating Lease (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Leases [Member]  
Operating Leased Assets [Line Items]  
2018 $ 12,683
2019 5,926
2020 4,393
2021 3,276
2022 2,932
Thereafter 8,431
Other [Member]  
Operating Leased Assets [Line Items]  
2018 115,710
2019 31,415
2020 18,674
2021 1,705
2022 4
Thereafter $ 1