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Schedule of Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Total assets $ 1,301,146 $ 1,212,127  
Goodwill 262,594 262,813 $ 263,032
Hub [Member]      
Segment Reporting Information [Line Items]      
Goodwill 233,205 233,424 233,643
Mode [Member]      
Segment Reporting Information [Line Items]      
Goodwill 29,389 29,389 $ 29,389
Operating Segments [Member] | Hub [Member]      
Segment Reporting Information [Line Items]      
Total assets 1,127,042 1,030,722  
Goodwill 233,205 233,424  
Operating Segments [Member] | Mode [Member]      
Segment Reporting Information [Line Items]      
Total assets 181,514 189,787  
Goodwill 29,389 29,389  
Intersegment Elims [Member]      
Segment Reporting Information [Line Items]      
Total assets $ (7,410) $ (8,382)