Risks and Uncertainties - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified			1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Credit Agreement [Member]	Apr. 30, 2013 PEAKS Guarantee [Member]	Dec. 31, 2012 PEAKS Guarantee [Member]	Dec. 31, 2013 2013 [Member] PEAKS Guarantee [Member] Scenario, Forecast [Member]	Dec. 31, 2013 2013 [Member] 2009 RSA [Member] Scenario, Forecast [Member]	Dec. 31, 2013 2014 [Member] PEAKS Guarantee [Member] Scenario, Forecast [Member]	Dec. 31, 2013 2014 [Member] 2009 RSA [Member] Scenario, Forecast [Member]
Unusual Risk or Uncertainty [Line Items]
Payments under PEAKS guarantee			$ 60,340	$ 12,342	$ 163,966		$ 9,165
Payments under Laon Program						9,009		14,251
Cash collateral, percentage	103.00%
Percentage of cash collateral amount equal to face amount	109.00%
Cash collateral to be provided for letter of credit as of the filing date	89,300
Borrowings under credit agreement		$ 50,000