Schedule of Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total assets	$ 1,266,470	$ 1,301,146
Goodwill	262,485	262,594
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Total assets	1,093,952	1,127,042
Goodwill	233,096	233,205
Operating Segments [Member] | Mode LLC [Member]
Segment Reporting Information [Line Items]
Total assets	180,902	181,514
Goodwill	29,389	29,389
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Total assets	$ (8,384)	$ (7,410)