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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) |

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