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Commitments and contingent liabilities - future minimum lease payments under noncancelable operating leases (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2018 $ 30,262
2019 26,531
2020 21,355
2021 18,186
2022 15,774
2023 and thereafter $ 27,167