Business Restructuring - Reconciliation of Restructuring Liability (Detail) (Severance Expense [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
2014 Restructuring [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring liability at Beginning Balance	$ 1,722
Amounts paid	(1,435)
Foreign currency translation	(23)
Restructuring liability at Ending Balance	264
2013 Restructuring [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring liability at Beginning Balance	563	1,040
Amounts paid	(338)	(420)
Foreign currency translation	(39)	(57)
Restructuring liability at Ending Balance	$ 186	$ 563