Risks and Uncertainties - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 17, 2015	Oct. 31, 2014
Unusual Risk or Uncertainty [Line Items]
Letter of credit termination date	Nov. 04, 2019
ED Escrowed Funds	$ 79,708		$ 79,708	$ 79,708
ED Letter of Credit payable					$ 79,708
Payments under PEAK Guarantee			30,090
Financing Agreement [Member]
Unusual Risk or Uncertainty [Line Items]
Outstanding principal balance	50,505	$ 97,500	69,681
2016 [Member]
Unusual Risk or Uncertainty [Line Items]
Payments under PEAKS guarantee	11,200
2016 [Member] | CUSO [Member]
Unusual Risk or Uncertainty [Line Items]
Payments under CUSO Program	16,200
2017 [Member]
Unusual Risk or Uncertainty [Line Items]
Payments under PEAKS guarantee	600
2017 [Member] | CUSO [Member]
Unusual Risk or Uncertainty [Line Items]
Payments under CUSO Program	12,000
CUSO RSA [Member]
Unusual Risk or Uncertainty [Line Items]
Net guarantee obligation payments	$ 7,928	$ 4,989
CUSO RSA [Member] | CUSO [Member]
Unusual Risk or Uncertainty [Line Items]
Net guarantee obligation payments			13,093
Recoveries from charged-off loans			$ 521