OPERATING SEGMENT DATA (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment reporting information
ASSETS	$ 1,034,462	$ 916,220	$ 860,951
CAPITAL EXPENDITURES, GROSS	75,251	83,637	47,765
DEPRECIATION AND AMORTIZATION EXPENSE	85,493	73,742	71,565
Assets acquired through capital leases and notes payable	37,973	30,410	36,343
Amortization of intangibles	2,261
Freight Transportation
Segment reporting information
ASSETS	556,195	600,239	565,461
CAPITAL EXPENDITURES, GROSS	68,235	78,875	44,637
DEPRECIATION AND AMORTIZATION EXPENSE	78,748	70,810	68,695
Premium Logistics and Expedited Freight Services
Segment reporting information
ASSETS	222,280
CAPITAL EXPENDITURES, GROSS	1,579
DEPRECIATION AND AMORTIZATION EXPENSE	3,179
Truck Brokerage and Management
Segment reporting information
ASSETS	9,656	6,225	5,250
CAPITAL EXPENDITURES, GROSS	45	163	12
DEPRECIATION AND AMORTIZATION EXPENSE	288	154	153
Emergency and Preventative Maintenance
Segment reporting information
ASSETS	18,413	13,634	12,373
CAPITAL EXPENDITURES, GROSS	685	307	311
DEPRECIATION AND AMORTIZATION EXPENSE	497	476	514
Household Goods Moving Services
Segment reporting information
ASSETS	21,754	20,687	18,016
CAPITAL EXPENDITURES, GROSS	416	480	209
DEPRECIATION AND AMORTIZATION EXPENSE	413	332	323
Other and eliminations
Segment reporting information
ASSETS	206,164	275,435	259,851
CAPITAL EXPENDITURES, GROSS	4,291	3,812	2,596
DEPRECIATION AND AMORTIZATION EXPENSE	$ 2,368	$ 1,970	$ 1,880