Annual report pursuant to Section 13 and 15(d)

Selected Balance Sheet Data - Schedule of Other Assets (Detail)

v3.8.0.1
Selected Balance Sheet Data - Schedule of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other Assets [Line Items]    
Other assets Current $ 5,529 $ 5,102
Other assets Non-Current 23,163 9,981
Due from independent contractors, net [Member]    
Other Assets [Line Items]    
Other assets Current 3,672 2,231
Other assets Non-Current 21,726 8,702
Security deposits [Member]    
Other Assets [Line Items]    
Other assets Current 0 0
Other assets Non-Current 1,158 1,059
Employee Notes Receivable [Member]    
Other Assets [Line Items]    
Other assets Current 366 314
Other assets Non-Current 255 132
Customer trust accounts and other [Member]    
Other Assets [Line Items]    
Other assets Current 1,491 2,557
Other assets Non-Current $ 24 $ 88