Goodwill and Intangible Assets - Summary of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Cost	$ 30,148	$ 30,148
Accumulated Amortization	26,117	25,544
Net Book Value	4,031	4,604
Customer contracts and relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	17,381	17,381
Accumulated Amortization	14,847	14,386
Net Book Value	2,534	2,995
Patents and technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	6,781	6,781
Accumulated Amortization	6,448	6,419
Net Book Value	333	362
Trademarks and trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	3,988	3,988
Accumulated Amortization	2,936	2,864
Net Book Value	1,052	1,124
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,998	1,998
Accumulated Amortization	1,886	1,875
Net Book Value	$ 112	$ 123