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Valuation And Qualifying Accounts (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Allowance For Uncollectible Trade Accounts
Dec. 31, 2011
Allowance For Uncollectible Trade Accounts
Dec. 31, 2010
Allowance For Uncollectible Trade Accounts
Dec. 31, 2012
Deferred tax valuation allowance
Dec. 31, 2011
Deferred tax valuation allowance
Dec. 31, 2009
Deferred tax valuation allowance
Valuation and Qualifying Accounts Disclosure [Line Items]            
Balance at Beginning of Year $ 7,730,000 $ 3,879,000 $ 4,607,000 $ 108,000 $ 379,000 $ 379,000
Charged to Costs & Expenses 208,000 5,314,000 [1] 207,000 14,000 (271,000)  
Charged to Other Accounts (623,000) [2] (1,294,000) [2] (625,000) [2]      
Deductions (626,000) [3] (169,000) [3] (310,000) [3]      
Balance at End of Year $ 6,689,000 $ 7,730,000 $ 3,879,000 $ 122,000 $ 108,000 $ 379,000
[1] Includes an increase in the allowance due to the Mode Transportation, LLC business acquisition of $4.4 million.
[2] Expected customer account adjustments charged to revenue and write-offs, net of recoveries
[3] Represents bad debt recoveries.