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Available-For-Sale Securities Adjusted cost (Detail) (USD $) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | $ 58,997,000 | $ 33,037,000 |  |
Unrealized Gains | 942,000 | 708,000 |  |
Unrealized Losses | (56,000) | (62,000) |  |
Accrued Interest | 111,000 | 117,000 |  |
Estimated Fair Value | 59,994,000 | 33,800,000 |  |
Cash & Cash Equivalents | 39,937,000 | 14,262,000 | 17,165,000 | 10,604,000
Investment Securities | 20,057,000 | 19,538,000 |  |
Cash |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 38,977,000 | 13,459,000 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Accrued Interest | 0 | 0 |  |
Estimated Fair Value | 38,977,000 | 13,459,000 |  |
Cash & Cash Equivalents | 38,977,000 | 13,459,000 |  |
Investment Securities | 0 | 0 |  |
Fair Value, Inputs, Level 1 |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 10,051,000 | 11,049,000 |  |
Unrealized Gains | 682,000 | 545,000 |  |
Unrealized Losses | (50,000) | (47,000) |  |
Accrued Interest | 34,000 | 43,000 |  |
Estimated Fair Value | 10,717,000 | 11,590,000 |  |
Cash & Cash Equivalents | 960,000 | 803,000 |  |
Investment Securities | 9,757,000 | 10,787,000 |  |
Fair Value, Inputs, Level 1 | Money Market Accounts |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 960,000 | 803,000 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Accrued Interest | 0 | 0 |  |
Estimated Fair Value | 960,000 | 803,000 |  |
Cash & Cash Equivalents | 960,000 | 803,000 |  |
Investment Securities | 0 | 0 |  |
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 234,000 | 755,000 |  |
Unrealized Gains | 13,000 | 17,000 |  |
Unrealized Losses | (1,000) | (8,000) |  |
Accrued Interest | 0 | 0 |  |
Estimated Fair Value | 246,000 | 764,000 |  |
Cash & Cash Equivalents | 0 | 0 |  |
Investment Securities | 246,000 | 764,000 |  |
Fair Value, Inputs, Level 1 | Corporate Equity Securities |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 1,853,000 | 1,319,000 |  |
Unrealized Gains | 489,000 | 270,000 |  |
Unrealized Losses | (46,000) | (37,000) |  |
Accrued Interest | 0 | 0 |  |
Estimated Fair Value | 2,296,000 | 1,552,000 |  |
Cash & Cash Equivalents | 0 | 0 |  |
Investment Securities | 2,296,000 | 1,552,000 |  |
Fair Value, Inputs, Level 1 | Government Agency Securities |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 7,004,000 | 8,172,000 |  |
Unrealized Gains | 180,000 | 258,000 |  |
Unrealized Losses | (3,000) | (2,000) |  |
Accrued Interest | 34,000 | 43,000 |  |
Estimated Fair Value | 7,215,000 | 8,471,000 |  |
Cash & Cash Equivalents | 0 | 0 |  |
Investment Securities | 7,215,000 | 8,471,000 |  |
Fair Value, Inputs, Level 2 |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 9,969,000 | 8,529,000 |  |
Unrealized Gains | 260,000 | 163,000 |  |
Unrealized Losses | (6,000) | (15,000) |  |
Accrued Interest | 77,000 | 74,000 |  |
Estimated Fair Value | 10,300,000 | 8,751,000 |  |
Cash & Cash Equivalents | 0 | 0 |  |
Investment Securities | 10,300,000 | 8,751,000 |  |
Fair Value, Inputs, Level 2 | Municipal Bonds |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 4,197,000 | 4,212,000 |  |
Unrealized Gains | 124,000 | 119,000 |  |
Unrealized Losses | (4,000) | 0 |  |
Accrued Interest | 27,000 | 27,000 |  |
Estimated Fair Value | 4,344,000 | 4,358,000 |  |
Cash & Cash Equivalents | 0 | 0 |  |
Investment Securities | 4,344,000 | 4,358,000 |  |
Fair Value, Inputs, Level 2 | Corporate Bond Securities |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 5,772,000 | 4,317,000 |  |
Unrealized Gains | 136,000 | 44,000 |  |
Unrealized Losses | (2,000) | (15,000) |  |
Accrued Interest | 50,000 | 47,000 |  |
Estimated Fair Value | 5,956,000 | 4,393,000 |  |
Cash & Cash Equivalents | 0 | 0 |  |
Investment Securities | $ 5,956,000 | $ 4,393,000 |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -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. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -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. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -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. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -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. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph 2, 3 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column C -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column C.7) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph Column E -Article 12 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column E.2,3) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph 7 -Article 12 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column C.3,4) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph 6 -Article 12 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph Column C -Article 12 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column C -Article 12 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13.Column C.6) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611282-123010 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph 3, 4 -Article 12 + Details
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