Business Restructuring and Asset Impairments - Reconciliation of Restructuring Liability (Detail) - 2016 Restructuring [Member] - Longford Mills [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost And Reserve [Line Items]
Restructuring liability	$ 1,985
Expense recognized	2,022	$ 2,817
Amounts paid	(3,389)	(781)
Foreign currency translation	73	(51)
Restructuring liability	691	1,985
Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring liability	1,548
Expense recognized		1,594
Amounts paid	(1,012)
Foreign currency translation	56	(46)
Restructuring liability	592	1,548
Other Expense [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring liability	437
Expense recognized	2,022	1,223
Amounts paid	(2,377)	(781)
Foreign currency translation	17	(5)
Restructuring liability	$ 99	$ 437