Defined Contribution Plan, Pension and Other Post-Retirement Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	$ (10,666)	$ (13,417)	$ (11,812)	$ (12,489)	$ (12,065)	$ (14,534)	$ (14,429)	$ (15,367)
Other Postretirement Benefit Plans | U.S. Pension and Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	633				0
Current liabilities	(19)				(28)
Noncurrent liabilities	(146)				(2,248)
Amount recognized	468				(2,276)
Pension Plans | Non-U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0				0
Current liabilities	0				0
Noncurrent liabilities	(10,520)				(9,841)
Amount recognized	$ (10,520)				$ (9,841)