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Schedule of Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Total assets $ 1,047,943 $ 919,853  
Goodwill 263,032 263,251 263,470
Operating Segments [Member] | Hub [Member]
      
Segment Reporting Information [Line Items]      
Total assets 887,848 759,797  
Goodwill 233,643 233,862  
Operating Segments [Member] | Mode [Member]
      
Segment Reporting Information [Line Items]      
Total assets 164,071 163,719  
Goodwill 29,389 29,389  
Intersegment Elims [Member]
      
Segment Reporting Information [Line Items]      
Total assets $ (3,976) $ (3,663)