Goodwill and Intangible Assets - Intangible Assets as a Direct Result from the Cadent Acquisition (Detail) - USD ($) $ in Thousands		12 Months Ended
	Apr. 29, 2011	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount as of December 31, 2012		$ 53,485	$ 53,485
Accumulated Amortization		(16,139)	(13,540)
Impairment Charge		(19,258)	(19,258)
Total		$ 18,088	$ 20,687
Trademarks
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives of intangibles		15 years	15 years
Gross Carrying Amount as of December 31, 2012		$ 7,100	$ 7,100
Accumulated Amortization		(1,492)	(1,354)
Impairment Charge		(4,179)	(4,179)
Total		$ 1,429	$ 1,567
Existing technology
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives of intangibles	13 years	13 years	13 years
Gross Carrying Amount as of December 31, 2012		$ 12,600	$ 12,600
Accumulated Amortization		(3,577)	(3,015)
Impairment Charge		(4,328)	(4,328)
Total		$ 4,695	$ 5,257
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives of intangibles	11 years	11 years	11 years
Gross Carrying Amount as of December 31, 2012		$ 33,500	$ 33,500
Accumulated Amortization		(10,957)	(9,095)
Impairment Charge		(10,751)	(10,751)
Total		$ 11,792	$ 13,654
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives of intangibles		8 years	8 years
Gross Carrying Amount as of December 31, 2012		$ 285	$ 285
Accumulated Amortization		(113)	(76)
Impairment Charge		0	0
Total		$ 172	$ 209