| Selected Balance Sheet Data - Schedule of Other Assets (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | 
|---|---|---|
| Other Assets [Line Items] | ||
| Other assets | $ 3,040 | $ 3,146 | 
| Commission notes receivable [Member] | ||
| Other Assets [Line Items] | ||
| Other assets | 27 | 82 | 
| Due from independent contractors [Member] | ||
| Other Assets [Line Items] | ||
| Other assets | 511 | 566 | 
| Security deposits [Member] | ||
| Other Assets [Line Items] | ||
| Other assets | 1,052 | 1,126 | 
| Other [Member] | ||
| Other Assets [Line Items] | ||
| Other assets | $ 1,450 | $ 1,372 |