Goodwill and Intangibles - Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 46,278
Accumulated Amortization		(45,162)
Impairment		(906)
Net Carrying Amount		210
Gross Carrying Amount, Held for sale		(2,056)
Accumulated Amortization, Held for sale		1,818
Impairment, Held for Sale		238
Net Carrying Amount, Held for Sale		0
Total amortizable intangible assets	$ 43,297	44,222
Total amortizable intangible assets, accumulated amortization	(43,239)	(43,344)
Total Impairment	0	(668)
Total Net Carrying Amount	58	210
Customer Related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	38,831	38,874
Accumulated Amortization	(38,831)	(38,822)
Impairment	0	(17)
Net Carrying Amount	0	35
Marketing Related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,727	3,336
Accumulated Amortization	(2,709)	(3,143)
Impairment	0	(138)
Net Carrying Amount	18	55
Technology Related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,739	4,068
Accumulated Amortization	(1,699)	(3,197)
Impairment	0	(751)
Net Carrying Amount	$ 40	$ 120