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Schedule of Amounts Recorded within Statements of Financial Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure
Retirement plans assets	$ 17,491	$ 7,712
United States Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Retirement plans assets	17,491	7,712
Accrued employees' compensation and withholdings	(2,524)	(2,591)
Retirement plans liabilities	(53,487)	(51,433)
Funded status	(38,520)	(46,312)
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Accrued employees' compensation and withholdings	(863)	(772)
Retirement plans liabilities	(37,183)	(32,395)
Funded status	(38,046)	(33,167)
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Accrued employees' compensation and withholdings	(591)	(571)
Retirement plans liabilities	(5,586)	(4,939)
Funded status	$ (6,177)	$ (5,510)

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