Acquisitions - Summary of Final Amounts Allocated to Acquired Assets and Assumed Liabilities (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|---|---|---|---|
| Business Acquisition [Line Items] | |||
| Goodwill | $ 24,682 | $ 20,008 | $ 20,031 |
| Jamison | |||
| Business Acquisition [Line Items] | |||
| Prepaid expense | 135 | ||
| Furniture and equipment | 335 | ||
| Security deposits | 30 | ||
| Capital leases | (253) | ||
| Deferred rent | (19) | ||
| Total fair value of net tangible assets acquired | 228 | ||
| Goodwill | 4,674 | ||
| Total purchase consideration | 10,706 | ||
| Jamison | Customer Relationships | |||
| Business Acquisition [Line Items] | |||
| Intangible asset | 5,000 | ||
| Jamison | Non-compete Agreements | |||
| Business Acquisition [Line Items] | |||
| Intangible asset | $ 804 |