Goodwill and Intangibles - Schedule of Carrying Value of Acquired Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Value	$ 4,270	$ 4,270	$ 4,270
Amortizable intangible assets, Accumulated Amortization	(2,301)	(1,422)	(2,081)
Amortizable intangible assets, Net Carrying Value	1,969	2,848	2,189
Customer Relationships [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Value	2,500	2,500	2,500
Amortizable intangible assets, Accumulated Amortization	(1,203)	(703)	(1,078)
Amortizable intangible assets, Net Carrying Value	$ 1,297	$ 1,797	$ 1,422
Amortizable intangible assets, Weighted Average Amortization Period	60 months	60 months	60 months
Non-compete Agreements [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Value	$ 1,120	$ 1,120	$ 1,120
Amortizable intangible assets, Accumulated Amortization	(560)	(336)	(504)
Amortizable intangible assets, Net Carrying Value	$ 560	$ 784	$ 616
Amortizable intangible assets, Weighted Average Amortization Period	60 months	60 months	60 months
Training Materials [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Value	$ 440	$ 440	$ 440
Amortizable intangible assets, Accumulated Amortization	(335)	(210)	(304)
Amortizable intangible assets, Net Carrying Value	$ 105	$ 230	$ 136
Amortizable intangible assets, Weighted Average Amortization Period	42 months	42 months	42 months
Accreditation [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Value	$ 210	$ 210	$ 210
Amortizable intangible assets, Accumulated Amortization	(203)	(173)	(195)
Amortizable intangible assets, Net Carrying Value	$ 7	$ 37	$ 15
Amortizable intangible assets, Weighted Average Amortization Period	84 months	84 months	84 months