Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (5,024)		$ (3,429)		$ (3,430)
Other comprehensive income (loss)	(4,725)		(1,595)		1
Ending Balance	(9,749)		(5,024)		(3,429)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2,809	[1]	2,568	[1]	1,867	[1]
Other comprehensive income (loss)	(1,510)	[1]	241	[1]	701	[1]
Ending Balance	1,299	[1]	2,809	[1]	2,568	[1]
Unrealized gain on investments and reclassifications
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance					568	[2]
Other comprehensive income (loss)					(568)	[2]
Pension liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(7,833)	[3]	(5,997)	[3]	(5,865)	[3]
Other comprehensive income (loss)	(3,215)	[3]	(1,836)	[3]	(132)	[3]
Ending Balance	$ (11,048)	[3]	$ (7,833)	[3]	$ (5,997)	[3]

[1] During the year ended December 31, 2012, the Company reclassified $1.5 million of net cumulative translation adjustments out of accumulated other comprehensive income (loss) into net income as part of the net gain on sale of the Laser Systems business. In addition, the Company recorded a $1.9 million deferred tax impact on net unrealized foreign currency gains on permanent intercompany loans in accumulated other comprehensive loss during 2012.

[2] During the year ended December 31, 2010, the Company reclassified $0.6 million out of accumulated other comprehensive loss into net loss.

[3] During the years ended December 31, 2012, 2011 and 2010, the Company reclassified $0.7 million, $0.3 million and $0.3 million, respectively, out of accumulated other comprehensive loss into net income (loss).