Intangible Assets and related Accumulated Amortization (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,672,000	$ 2,675,000
Accumulated Amortization	2,244,000	1,672,000
Customer lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	235,000	235,000
Accumulated Amortization	206,000	128,000
Weighted-Avg. Amortization Period	3 years
Trademarks, patents and copyrights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,437,000	2,440,000
Accumulated Amortization	$ 2,038,000	$ 1,544,000
Weighted-Avg. Amortization Period	4 years

The aggregate cost of a major indefinite-lived intangible asset class acquired, during the period, either individually or as part of a group of assets (in either an asset acquisition or business combination).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_AcquiredIndefiniteLivedIntangibleAssetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant