Business Restructuring - Reconciliation of Restructuring Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Cost And Reserve [Line Items]
Expense recognized	$ 586		$ 1,061	$ 1,372	$ 1,061
Longford Mills Shutdown [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring liability	1,316	$ 1,985		1,985
Expense recognized	454	786
Amounts paid	(783)	(1,478)
Foreign currency translation	23	23
Restructuring liability	1,010	1,316		1,010
Longford Mills Shutdown [Member] | Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring liability	1,015	1,548		1,548
Amounts paid	(168)	(550)
Foreign currency translation	20	17
Restructuring liability	867	1,015		867
Longford Mills Shutdown [Member] | Other Expense [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring liability	301	437		437
Expense recognized	454	786
Amounts paid	(615)	(928)
Foreign currency translation	3	6
Restructuring liability	$ 143	$ 301		$ 143