Business and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended		1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 First Three Percent Of Contributions On Defined Contribution Plan	Jun. 30, 2012 Next Two Percent Of Contributions On Defined Contribution Plan	Jun. 30, 2012 Defined Contribution 401 K Plan	Jun. 30, 2012 Defined Contribution 401 K Plan	Jun. 30, 2012 Noncompete Agreements Year	Jul. 08, 2011 Eleets Transportation Company Inc	Jun. 30, 2012 Common Stock Equivalents	Jun. 30, 2011 Common Stock Equivalents	Jun. 30, 2012 Common Stock Equivalents	Jun. 30, 2011 Common Stock Equivalents	Jun. 30, 2012 Minimum	Jun. 30, 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
Revenue	69,197,000	86,965,000	130,996,000	162,444,000	320,000,000
Income from operations	1,895,000	1,592,000	3,331,000	2,832,000	6,400,000
Net income	1,085,000	905,000	1,915,000	1,565,000	3,600,000
Estimated Useful lives of Fixed Assets																3 years	5 years
Estimated Useful Life of Other Intangible Assets										3
Defined Benefit Plan Employee Contribution Percentage			5.00%
Defined Benefit Plan Employer Matching Percent of Employee Contribution						100.00%	50.00%
Defined Benefit Plan Maximum Percentage of Employee Contribution			4.00%
401(K) expenses charged to Operations	$ 2,924,000	$ 2,661,000	$ 5,961,000	$ 5,036,000				$ 4,000	$ 10,000
Common stock Shares Outstanding	34,135,000	33,916,000	34,133,000	33,760,000								1,641,000	1,721,000	1,599,000	1,655,000