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Commitments and contingent liabilities - future minimum lease payments under noncancelable operating leases (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2017 $ 29,546
2018 23,224
2019 20,349
2020 16,887
2021 14,318
2022 and thereafter $ 36,664