Quarterly report pursuant to Section 13 or 15(d)

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

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Selected Balance Sheet Data - Schedule of Other Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Other Assets [Line Items]    
Other assets Current $ 3,092 $ 2,839
Other assets Non-Current 5,198 3,282
Due from independent contractors [Member]    
Other Assets [Line Items]    
Other assets Current 1,387 1,577
Other assets Non-Current 3,700 1,820
Security deposits [Member]    
Other Assets [Line Items]    
Other assets Non-Current 1,284 1,240
Customer trust accounts and other [Member]    
Other Assets [Line Items]    
Other assets Current 1,705 1,262
Other assets Non-Current $ 214 $ 222