Contingencies - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Jan. 31, 2013	Mar. 26, 2012	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Oct. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Apr. 30, 2013
Loss Contingencies [Line Items]
Face amount of surety bonds			$ 19,500		$ 19,500
Letters of credit issued			2,246		2,246
Amount included in Other current liabilities offset against receivable under Revolving Note			8,500		8,500
Payment under settlement agreement	$ 46,000		0	$ 0	$ 0	$ 46,000
Life of private education loan made under RSAs					10 years
Range of possible losses less than amount accrued			10,000		$ 10,000
Range of possible losses greater than portion accrued			37,000		37,000
Litigation settlement amount		$ 395
Additional payments expected in 2018			72,005		72,005
Discount on guarantee regular payments and recoveries					8,133
Collateral maintained with bank for education loan			8,600	8,600	8,600	8,600			$ 8,600	$ 8,600
Increase in collateral maintained in restricted bank account					2,600
Recoveries from charged-off loans			256	173	475	227
Offset amounts relating to guarantee obligations				$ 7,577		$ 8,114
Nonaffiliated Entity [Member]
Loss Contingencies [Line Items]
Recoveries from charged-off loans					1,000
Amount of offset to repay			8,600		8,600
Payable in 2018 through 2027 [Member]
Loss Contingencies [Line Items]
Estimated regular payment made					102,100
Payable 2023 through 2027 [Member]
Loss Contingencies [Line Items]
Estimated regular payment made					16,200
Scenario, Forecast [Member]
Loss Contingencies [Line Items]
Letter of credit payable							$ 79,708	$ 106
Education Loan Under 2009 Loan Program [Member]
Loss Contingencies [Line Items]
Principal amount for private education loans			141,000		141,000
Fourth Amendment [Member]
Loss Contingencies [Line Items]
Discharge Payments					2,577
Maximum [Member]
Loss Contingencies [Line Items]
Decrease in unrecognized tax benefit due to resolution of tax matters			5,945		5,945
Maximum [Member] | Payable 2018 through 2022 [Member]
Loss Contingencies [Line Items]
Estimated regular payment made					17,400
Maximum [Member] | Scenario, Forecast [Member]
Loss Contingencies [Line Items]
Letter of credit payable							$ 82,060
Minimum [Member]
Loss Contingencies [Line Items]
Decrease in unrecognized tax benefit due to resolution of tax matters			0		0
Minimum [Member] | Payable 2018 through 2022 [Member]
Loss Contingencies [Line Items]
Estimated regular payment made					16,100
Revolving Note [Member]
Loss Contingencies [Line Items]
Credit facility outstanding, amount			$ 8,200		$ 8,200