Business Segments - Business Segment Information Based on Net Revenues and Net Income from Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues
Total net revenue	$ 38,350	$ 29,646
Income from operations
Total income from operations	3,298	3,173
Operating Segments [Member] | Workforce Development [Member]
Revenues
Total net revenue	30,957	23,140
Income from operations
Total income from operations	7,880	6,816
Operating Segments [Member] | Research/Patient Experience [Member]
Revenues
Total net revenue	7,393	6,506
Income from operations
Total income from operations	178	301
Unallocated [Member]
Income from operations
Total income from operations	$ (4,760)	$ (3,944)