Goodwill and Other Intangible Assets - Summary of Other Intangible Assets Net by Segment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Total Other intangible assets, net	$ 25,301	$ 26,637
Executive Search and Leadership Consulting [Member]
Finite-Lived Intangible Assets [Line Items]
Total Other intangible assets, net	1,834	1,931
Executive Search and Leadership Consulting [Member] | Americas [Member]
Finite-Lived Intangible Assets [Line Items]
Total Other intangible assets, net	1,264	1,340
Executive Search and Leadership Consulting [Member] | Asia Pacific [Member]
Finite-Lived Intangible Assets [Line Items]
Total Other intangible assets, net	570	591
Culture Shaping [Member]
Finite-Lived Intangible Assets [Line Items]
Total Other intangible assets, net	$ 23,467	$ 24,706