Amounts Recognized in Statement of Financial Position (Detail) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Current liabilities		$ (17,670)	$ (399)
Noncurrent liabilities		(11,887)	(26,361)
Accumulated other comprehensive loss (income)	[1]	13,981	10,720
Total		(15,576)	(16,040)
Non-U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities		(17,812)	(16,695)
Accumulated other comprehensive loss (income)	[1]	(1,857)	(2,038)
Total		$ (19,669)	$ (18,733)

[1] The accumulated other comprehensive income on the Consolidated Balance Sheets as of December 31, 2017 and 2016 is presented net of income tax.