Defined Contribution Plans, Pension and Other Post-Retirement Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	$ 15,450	$ 18,938
U.S. Pension and Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	52	64
Noncurrent liabilities	4,974	9,058
Amount recognized	5,026	9,122
Non-U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	0	0
Noncurrent liabilities	10,360	9,740
Amount recognized	$ 10,360	$ 9,740