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Schedule of Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Total assets $ 1,123,414 $ 1,047,943
Goodwill 262,923 263,032
Operating Segments [Member] | Hub [Member]
    
Segment Reporting Information [Line Items]    
Total assets 944,017 887,848
Goodwill 233,534 233,643
Operating Segments [Member] | Mode [Member]
    
Segment Reporting Information [Line Items]    
Total assets 185,359 164,071
Goodwill 29,389 29,389
Intersegment Elims [Member]
    
Segment Reporting Information [Line Items]    
Total assets (5,962) (3,976)
Goodwill