Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount of expense related to estimated loss from loan and lease transactions.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Variable Interest Entities - Schedule of Revenue and Expenses of CUSO (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
Student services and administrative expenses	$ 91,891	$ 100,440	$ 97,547	$ 99,238	$ 101,303	$ 96,182	$ 98,335	$ 101,721	$ 389,116	$ 397,541	$ 400,856
Provision for private education loan losses	568us-gaap_ProvisionForLoanAndLeaseLosses	4,511us-gaap_ProvisionForLoanAndLeaseLosses	9,071us-gaap_ProvisionForLoanAndLeaseLosses	0us-gaap_ProvisionForLoanAndLeaseLosses	8,648us-gaap_ProvisionForLoanAndLeaseLosses	16,382us-gaap_ProvisionForLoanAndLeaseLosses	4,319us-gaap_ProvisionForLoanAndLeaseLosses	0us-gaap_ProvisionForLoanAndLeaseLosses	14,150us-gaap_ProvisionForLoanAndLeaseLosses	29,349us-gaap_ProvisionForLoanAndLeaseLosses	0us-gaap_ProvisionForLoanAndLeaseLosses
Interest expense	9,305us-gaap_InterestExpense	5,831us-gaap_InterestExpense	6,263us-gaap_InterestExpense	6,901us-gaap_InterestExpense	7,144us-gaap_InterestExpense	7,190us-gaap_InterestExpense	7,369us-gaap_InterestExpense	3,574us-gaap_InterestExpense	28,300us-gaap_InterestExpense	25,277us-gaap_InterestExpense	3,723us-gaap_InterestExpense
Income (loss) before provision for income taxes	25,335	17,600	574	6,141	(53,777)	12,760	26,707	(22,926)	49,650	(37,236)	227,988
CUSO [Member]
Variable Interest Entity [Line Items]
Revenue									1,136
Student services and administrative expenses									437
Provision for private education loan losses									2,039
Interest expense									3,725
Income (loss) before provision for income taxes									$ (5,065)