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Schedule of Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Total assets $ 1,334,939 $ 1,360,259
Goodwill 262,321 262,376
Operating Segments [Member] | Hub [Member]    
Segment Reporting Information [Line Items]    
Total assets 1,169,159 1,178,110
Goodwill 232,932 232,987
Operating Segments [Member] | Mode LLC [Member]    
Segment Reporting Information [Line Items]    
Total assets 172,416 191,374
Goodwill 29,389 29,389
Intersegment Elims [Member]    
Segment Reporting Information [Line Items]    
Total assets $ (6,636) $ (9,225)