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Valuation and Qualifying Accounts (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Uncollectible Trade Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 6,689,000 $ 7,730,000 $ 3,879,000
Charged to Costs & Expenses 662,000 208,000 5,314,000 [1]
Charged to Other Accounts 142,000 [2] (623,000) [2] (1,294,000) [2]
Deductions (47,000) [3] (626,000) [3] (169,000) [3]
Balance at End of Year 7,446,000 6,689,000 7,730,000
Deferred tax valuation allowance [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 122,000 108,000 379,000
Charged to Costs & Expenses (14,000) 14,000 (271,000)
Balance at End of Year $ 108,000 $ 122,000 $ 108,000
[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.