Goodwill and Intangible Assets - Summary of the Identifiable Intangible Assets Subject for Amortization (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 17,337	$ 16,841
Impairment Charges
Accumulated Amortization	16,381	15,647
Net Carrying Amount	956	1,194
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,860	3,860
Impairment Charges
Accumulated Amortization	3,634	3,434
Net Carrying Amount	226	426
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,378	10,378
Impairment Charges
Accumulated Amortization	10,239	10,065
Net Carrying Amount	139	313
Asset Purchase Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,400	1,400
Impairment Charges
Accumulated Amortization	1,400	1,400
Trade Name and Trademark [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	600	600
Impairment Charges
Accumulated Amortization	586	554
Net Carrying Amount	14	46
Capitalized Product Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,099	603
Impairment Charges
Accumulated Amortization	522	194
Net Carrying Amount	$ 577	$ 409