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Long-term Debt - Additional Information (Detail) (USD $) | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Letter of Credit [Member] | Mar. 31, 2014 LIBOR [Member] | Mar. 31, 2013 LIBOR [Member] | Mar. 31, 2014 Base Rate [Member] | Mar. 31, 2013 Base Rate [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum limit for revolving line of credit | $ 50,000,000 |  |  |  |  |  |
Line of credit facility maturity date | May 04, 2016 |  |  |  |  |  |
Debt instrument, description of variable rate basis | LIBOR |  |  |  |  |  |
Line of credit outstanding |  |  |  | 16,000,000 | 24,500,000 | 2,555,000 | 2,769,000
Interest rate |  |  |  | 2.25% | 2.25% | 4.25% | 4.25%
Available borrowings under LOC | 21,101,000 | 15,556,000 |  |  |  |  |
Monthly fee on the average unused commitment | 0.375% |  |  |  |  |  |
Contingent interest rate increase | 2.00% |  |  |  |  |  |
Letters of credit |  |  | 10,000,000 |  |  |  |
Outstanding letters of credit | $ 7,175,000 | $ 7,175,000 |  |  |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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