Commitments and Contingencies - Summary of Restructuring Activity and Status of the Reserves (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]
Accrual Balance, Beginning Balance	$ 1
Restructuring Expense	254
Payments/Charges	(199)
Accrual Balance, Ending Balance	56
2013 Telworx integration [Member]
Restructuring Cost and Reserve [Line Items]
Accrual Balance, Beginning Balance	0
Restructuring Expense	254
Payments/Charges	(198)
Accrual Balance, Ending Balance	56
2013 Telworx integration [Member] | Employee Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Accrual Balance, Beginning Balance	0
Restructuring Expense	188
Payments/Charges	(132)
Accrual Balance, Ending Balance	56
2013 Telworx integration [Member] | Asset Disposals [Member]
Restructuring Cost and Reserve [Line Items]
Accrual Balance, Beginning Balance	0
Restructuring Expense	66
Payments/Charges	(66)
Accrual Balance, Ending Balance	0
2012 Bloomingdale manufacturing [Member]
Restructuring Cost and Reserve [Line Items]
Accrual Balance, Beginning Balance	1
Restructuring Expense	0
Payments/Charges	(1)
Accrual Balance, Ending Balance	$ 0