Goodwill and Other Intangible Assets - Summary of Other Intangible Assets Net by Segment (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Finite-Lived Intangible Assets [Line Items] | ||
| Net Carrying Amount | $ 18,687 | $ 20,939 |
| Executive Search and Leadership Consulting [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Net Carrying Amount | 3,521 | 1,427 |
| Executive Search and Leadership Consulting [Member] | Americas [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Net Carrying Amount | 764 | 1,044 |
| Executive Search and Leadership Consulting [Member] | Europe [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Net Carrying Amount | 2,548 | 0 |
| Executive Search and Leadership Consulting [Member] | Asia Pacific [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Net Carrying Amount | 209 | 383 |
| Culture Shaping [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Net Carrying Amount | $ 15,166 | $ 19,512 |