Risks and Uncertainties - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 04, 2014
Unusual Risk or Uncertainty [Line Items]
Letter of credit termination date			Nov. 04, 2019
Percentage of cash collateral amount equal to face amount	103.00%		103.00%
Percentage of cash collateral amount equal to face amount of ED Letter of Credit	109.00%		109.00%
Cash collateral to be provided for letter of credit as of the filing date	$ 89,200		$ 89,200
Payments under PEAK Guarantee					$ 159,300
Payments on Behalf of Borrowers					1,832
CUSO RSA [Member]
Unusual Risk or Uncertainty [Line Items]
Net guarantee obligation payments	$ 8,104	$ 1,589	13,093	$ 2,747
CUSO RSA [Member] | CUSO [Member]
Unusual Risk or Uncertainty [Line Items]
Net guarantee obligation payments					9,139
Recoveries from charged-off loans					$ 466
2015 [Member]
Unusual Risk or Uncertainty [Line Items]
Payments under PEAKS guarantee			30,800
Payments under CUSO Program			13,093
2015 [Member] | CUSO RSA [Member]
Unusual Risk or Uncertainty [Line Items]
Recoveries from charged-off loans			521
2016 [Member]
Unusual Risk or Uncertainty [Line Items]
Payments under PEAKS guarantee			5,300
Payments under CUSO Program			$ 21,663
Minimum [Member]
Unusual Risk or Uncertainty [Line Items]
Percentage of cash collateral amount equal to face amount	103.00%		103.00%
Percentage of cash collateral amount equal to face amount of ED Letter of Credit	109.00%		109.00%
Term Loan [Member]
Unusual Risk or Uncertainty [Line Items]
Cash collateral to be provided for letter of credit as of the filing date						$ 89,200
Aggregate principal amount	$ 100,000		$ 100,000			$ 100,000