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Employee Benefit Plans - Amounts Recognized in the Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accrued expenses $ (8,945) $ (10,400)
Accrued retirement benefits (3,604) (4,136)
Pension Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accrued expenses   0
Accrued retirement benefits   0
Net amount recognized   0
Post-Employment Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accrued expenses (502) (545)
Accrued retirement benefits (3,604) (4,136)
Net amount recognized $ (4,106) $ (4,681)