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Commitments and Contingent Liabilities - Future Minimum Lease Payments under Operating Leases (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2018 $ 29,366
2019 21,569
2020 17,799
2021 13,436
2022 10,780
Thereafter 17,202
Subtotal 110,152
Sublease income (30)
Total minimum lease payments $ 110,122