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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Receivables [Abstract] |  |  |  |  |  |
Balance, Beginning of Period | $ 17,570 us-gaap_AllowanceForDoubtfulAccountsReceivable |  | $ 21,524 us-gaap_AllowanceForDoubtfulAccountsReceivable |  | $ 26,371 us-gaap_AllowanceForDoubtfulAccountsReceivable |
Charges to Expense | 15,850 us-gaap_ProvisionForDoubtfulAccounts | [1] | 20,418 us-gaap_ProvisionForDoubtfulAccounts | [1] | 21,914 us-gaap_ProvisionForDoubtfulAccounts | [1]
Amounts Written-off | (18,903)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs |  | (24,372)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs |  | (26,761)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs |
Balance, End of Period | $ 14,517 us-gaap_AllowanceForDoubtfulAccountsReceivable |  | $ 17,570 us-gaap_AllowanceForDoubtfulAccountsReceivable |  | $ 21,524 us-gaap_AllowanceForDoubtfulAccountsReceivable |
[1] | Charges to expense include an offset for recoveries of amounts previously written off of $5.7 million, $5.1 million and $6.1 million for the years ended December 31, 2014, 2013 and 2012, respectively.

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 310 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35755819&loc=SL9156395-115594 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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