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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating Loss Carryforwards [Line Items] |  |  |  |
Retroactive tax relief | $ 500,000 |  |  |
Alternative minimum tax (ATM) remaining state tax NOL carryforwards | 22,000,000 |  |  |
Current period excess stock-based compensation tax deduction | 0 | 500,000 | 1,300,000 |
Unrecognized federal and state tax benefits | 2,409,000 | 2,292,000 | 709,000 | 700,000
Net unrecognized tax benefits | 204,000 | 236,000 | 461,000 |
Interest and penalties associated with unrecognized tax benefits | 121,000 | 430,000 | 42,000 |
Interest and penalties accrued | 585,000 | 464,000 |  |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
State NOL carryforwards | 100,000 | 100,000 | 200,000 |
Alternative minimum tax (ATM) remaining state tax NOL carryforwards |  | 43,600,000 |  |
Portion of state NOL carryforwards, not able to be utilized before expiration | 8,300,000 | 6,800,000 | 6,900,000 |
Federal benefit | 300,000 | 300,000 | 300,000 |
Deferred tax assets, operating loss carryforwad, excess tax benefits | 1,000,000 |  |  |
Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Gross tax credits | 905,000 |  |  |
Tax carryforward period | 20 years |  |  |
Alternative minimum tax (ATM) remaining state tax NOL carryforwards | 29,900,000 |  |  |
Deferred tax assets, operating loss carryforwad, excess tax benefits | 1,400,000 |  |  |
Federal And State Tax [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Unrecognized federal and state tax benefits | $ 500,000 | $ 0 |  |

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- Definition A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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