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Available-For-Sale Securities Adjusted cost (Detail) (USD $) | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | $ 77,942,000 | $ 58,997,000 |  |
Unrealized Gains | 650,000 | 942,000 |  |
Unrealized Losses | (590,000) | (56,000) |  |
Accrued Interest | 110,000 | 111,000 |  |
Estimated Fair Value | 78,112,000 | 59,994,000 |  |
Cash & Cash Equivalents | 44,405,000 | 39,937,000 | 37,120,000 | 14,262,000
Investment Securities | 33,707,000 | 20,057,000 |  |
Cash |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 42,531,000 | 38,977,000 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Accrued Interest | 0 | 0 |  |
Estimated Fair Value | 42,531,000 | 38,977,000 |  |
Cash & Cash Equivalents | 42,531,000 | 38,977,000 |  |
Investment Securities | 0 | 0 |  |
Fair Value, Inputs, Level 1 |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 23,571,000 | 10,051,000 |  |
Unrealized Gains | 502,000 | 682,000 |  |
Unrealized Losses | (502,000) | (50,000) |  |
Accrued Interest | 29,000 | 34,000 |  |
Estimated Fair Value | 23,600,000 | 10,717,000 |  |
Cash & Cash Equivalents | 1,874,000 | 960,000 |  |
Investment Securities | 21,726,000 | 9,757,000 |  |
Fair Value, Inputs, Level 1 | Money Market Accounts |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 1,874,000 | 960,000 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Accrued Interest | 0 | 0 |  |
Estimated Fair Value | 1,874,000 | 960,000 |  |
Cash & Cash Equivalents | 1,874,000 | 960,000 |  |
Investment Securities | 0 | 0 |  |
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 9,361,000 | 234,000 |  |
Unrealized Gains | 16,000 | 13,000 |  |
Unrealized Losses | (242,000) | (1,000) |  |
Accrued Interest | 0 | 0 |  |
Estimated Fair Value | 9,135,000 | 246,000 |  |
Cash & Cash Equivalents | 0 | 0 |  |
Investment Securities | 9,135,000 | 246,000 |  |
Fair Value, Inputs, Level 1 | Corporate Equity Securities |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 4,527,000 | 1,853,000 |  |
Unrealized Gains | 410,000 | 489,000 |  |
Unrealized Losses | (170,000) | (46,000) |  |
Accrued Interest | 0 | 0 |  |
Estimated Fair Value | 4,767,000 | 2,296,000 |  |
Cash & Cash Equivalents | 0 | 0 |  |
Investment Securities | 4,767,000 | 2,296,000 |  |
Fair Value, Inputs, Level 1 | Government Agency Securities |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 7,809,000 | 7,004,000 |  |
Unrealized Gains | 76,000 | 180,000 |  |
Unrealized Losses | (90,000) | (3,000) |  |
Accrued Interest | 29,000 | 34,000 |  |
Estimated Fair Value | 7,824,000 | 7,215,000 |  |
Cash & Cash Equivalents | 0 | 0 |  |
Investment Securities | 7,824,000 | 7,215,000 |  |
Fair Value, Inputs, Level 2 |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 11,840,000 | 9,969,000 |  |
Unrealized Gains | 148,000 | 260,000 |  |
Unrealized Losses | (88,000) | (6,000) |  |
Accrued Interest | 81,000 | 77,000 |  |
Estimated Fair Value | 11,981,000 | 10,300,000 |  |
Cash & Cash Equivalents | 0 | 0 |  |
Investment Securities | 11,981,000 | 10,300,000 |  |
Fair Value, Inputs, Level 2 | Municipal Bonds |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 3,629,000 | 4,197,000 |  |
Unrealized Gains | 88,000 | 124,000 |  |
Unrealized Losses | (1,000) | (4,000) |  |
Accrued Interest | 24,000 | 27,000 |  |
Estimated Fair Value | 3,740,000 | 4,344,000 |  |
Cash & Cash Equivalents | 0 | 0 |  |
Investment Securities | 3,740,000 | 4,344,000 |  |
Fair Value, Inputs, Level 2 | Corporate Bond Securities |  |  |  |
Cash and Cash Equivalents and Marketable Securites [Line Items] |  |  |  |
Cost | 8,211,000 | 5,772,000 |  |
Unrealized Gains | 60,000 | 136,000 |  |
Unrealized Losses | (87,000) | (2,000) |  |
Accrued Interest | 57,000 | 50,000 |  |
Estimated Fair Value | 8,241,000 | 5,956,000 |  |
Cash & Cash Equivalents | 0 | 0 |  |
Investment Securities | $ 8,241,000 | $ 5,956,000 |  |

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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 -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: 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 5: 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=28358313&loc=d3e6676-107765 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=31042434&loc=d3e3044-108585 + Details
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