Contingencies - Additional Information (Detail) (USD $)	9 Months Ended		3 Months Ended		9 Months Ended	3 Months Ended				9 Months Ended	3 Months Ended		9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 Scotland EMS Manufacturing Facility [Member]	Dec. 31, 2011 Thailand Ems Manufacturing Facility [Member]	Jun. 03, 2011 Damage from fire [Member] Scotland EMS Manufacturing Facility [Member]	Sep. 30, 2012 Damage from fire [Member] Scotland EMS Manufacturing Facility [Member]	Jun. 03, 2011 Damage from fire [Member] Inventory [Member] Scotland EMS Manufacturing Facility [Member]	Jun. 03, 2011 Damage from fire [Member] Machinery and equipment [Member] Scotland EMS Manufacturing Facility [Member]	Sep. 30, 2012 Damage from flood [Member] Thailand Ems Manufacturing Facility [Member]	Dec. 31, 2011 Damage from flood [Member] Thailand Ems Manufacturing Facility [Member]	Sep. 30, 2012 Damage from flood [Member] Thailand Ems Manufacturing Facility [Member]	Dec. 31, 2011 Damage from flood [Member] Inventory [Member] Thailand Ems Manufacturing Facility [Member]	Dec. 31, 2011 Damage from flood [Member] Machinery and equipment [Member] Thailand Ems Manufacturing Facility [Member]	Sep. 30, 2012 Business Interruption Caused Due To Fire [Member] Scotland EMS Manufacturing Facility [Member]	Sep. 30, 2012 Business Interruption Caused Due To Flood [Member] Thailand Ems Manufacturing Facility [Member]	Sep. 30, 2012 Business Interruption Caused Due To Flood [Member] Thailand Ems Manufacturing Facility [Member]	Sep. 30, 2012 Property Damages Caused Due To Flood [Member] Thailand Ems Manufacturing Facility [Member]
Contingencies Textual [Abstract]
Net book value of assets damaged						$ 1,600,000	$ 200,000				$ 800,000	$ 500,000
Value of insurance coverage deducted				100,000
Reimbursement of insurance claim					1,000,000			4,200,000						4,200,000
Recorded reimbursement for business interruption													900,000		14,400,000	1,800,000
Expense related to Business interruption insurance recovery		100,000
Fixed costs incurred at facility									2,500,000
Insurance receivable recorded earlier, adjusted against proceeds			2,400,000
Value of insurance coverage deducted			250,000
Global insurance policy covered costs			25,000,000
Proceeds from insurance claim	17,703,000									18,900,000					15,800,000	3,100,000
Insurance receivable relieved			$ 2,400,000