Restructuring Charge - Summary of Restructuring Accrual and Activity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended							9 Months Ended				12 Months Ended
	Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 0		$ 610		$ 130			$ 130		$ 1,933		$ 1,933
Restructuring charge	0		172		572		354	744		1,847		2,031
Foreign exchange					(5)
Cash payments			(782)		(87)							(4,045)
Discontinued operations												(93)
Non-cash portion												304
Ending Balance	0		0		610			0				130
Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			610	[1]	130	[1]		130	[1]	1,354	[1]	1,354	[1]
Restructuring charge			172	[1]	494	[1]						1,542	[1]
Foreign exchange					(5)	[1]
Cash payments			(782)	[1]	(9)	[1]						(2,880)	[1]
Discontinued operations												114	[1]
Non-cash portion												0	[1]
Ending Balance	0	[1]	0	[1]	610	[1]		0	[1]			130	[1]
Asset Write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			0		0			0		0		0
Restructuring charge			0		0							0
Foreign exchange					0
Cash payments			0		0							0
Discontinued operations												(304)
Non-cash portion												304
Ending Balance	0		0		0			0				0
Contract Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			0	[2]	0	[2]		0	[2]	579	[2]	579	[2]
Restructuring charge			0	[2]	78	[2]						266	[2]
Foreign exchange					0	[2]
Cash payments			0	[2]	(78)	[2]						(942)	[2]
Discontinued operations												97	[2]
Non-cash portion												0	[2]
Ending Balance	0	[2]	0	[2]	0	[2]		0	[2]			0	[2]
Other [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			0		0			0		0		0
Restructuring charge			0		0							223
Foreign exchange					0
Cash payments			0		0							(223)
Discontinued operations												0
Non-cash portion												0
Ending Balance	$ 0		$ 0		$ 0			$ 0				$ 0

[1] Costs include severance, termination benefits, and outplacement support.

[2] Costs include lease costs related to excess office space and certain property, plant and equipment.