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Business and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 First Three Percent Of Contributions On Defined Contribution Plan | Dec. 31, 2012 Next Two Percent Of Contributions On Defined Contribution Plan | Dec. 31, 2012 Defined Contribution 401 K Plan | Dec. 31, 2011 Defined Contribution 401 K Plan | Jul. 31, 2011 Noncompete Agreements | Dec. 31, 2012 Noncompete Agreements | Jul. 08, 2011 Eleets Transportation Company Inc | Dec. 31, 2012 Common Stock Equivalents | Dec. 31, 2011 Common Stock Equivalents | Dec. 31, 2012 Minimum | Dec. 31, 2012 Maximum
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue earned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Business Acquisition Purchase Price Allocation Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |
Business Acquisition Purchase Price Allocation Liabilities Assumed of Certain Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,400,000 |  |  |  |
Revenues | 75,318,000 | 71,856,000 | 69,197,000 | 61,800,000 | 72,167,000 | 85,359,000 | 86,965,000 | 75,479,000 | 278,171,000 | 319,970,000 |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 7,418,000 | 6,432,000 |  |  |  |  |  |  |  |  |  |  |
Net income | 1,050,000 | 1,390,000 | 1,085,000 | 831,000 | 1,128,000 | 944,000 | 905,000 | 661,000 | 4,356,000 | 3,638,000 |  |  |  |  |  |  |  |  |  |  |
Estimated Useful lives of Fixed Assets |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  | 3 years | 5 years
Estimated Useful Life of Other Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Defined Benefit Plan Employee Contribution Percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  | 5.00% |  |  |  |  |
Defined Benefit Plan Employer Matching Percent of Employee Contribution |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Maximum Percentage of Employee Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 4.00% |  |  |  |  |
401(K) expenses charged to Operations |  |  |  |  |  |  |  |  |  |  |  |  | 22,000 | 32,000 |  |  |  |  |  |  |
Common stock Shares Outstanding |  |  |  |  |  |  |  |  | 34,151,000 | 33,908,000 |  |  |  |  |  |  |  | 1,878,000 | 1,488,000 |  |
Amortization of Intangible Assets |  |  |  |  |  |  |  |  | $ 30,000 |  |  |  |  |  |  |  |  |  |  |  |
Period For Examination Of Tax Returns |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |

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