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Leases - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Operating leases expiration date | 2023 |  |
Depreciation expense for continuing operations | $ 67,400,000 | $ 73,300,000 | $ 70,800,000
Operating leases obligation | 485,158,000 |  |
Assets Under Capital Lease [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Depreciation expense for continuing operations | 0 |  | 600,000
Assets recorded under capital leases from continuing operation | 4,500,000 |  |
Continuing Operations [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense, exclusive of related taxes | 87,500,000 | 89,000,000 | 92,900,000
Operating leases obligation | 430,831,000 |  |
Discontinued Operations [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rent expense, exclusive of related taxes | 21,900,000 | 21,300,000 | 27,000,000
Operating leases obligation | 54,327,000 |  |
Transitional Schools [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Operating leases obligation | 79,000,000 |  |
Minimum [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Lease term range, years | 5 years |  |
Number of renewal options for extended terms | 1 year |  |
Maximum [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Lease term range, years | 10 years |  |
Number of renewal options for extended terms | 2 years |  |
Maximum [Member] | Assets Under Capital Lease [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Depreciation expense for continuing operations |  | $ 100,000 |

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- Definition Operating Lease Expiration Date + References No definition available. + Details
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- Definition Operating leases general lease term. + References No definition available. + Details
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- Definition Operating Leases Number Of Renewal Options For Extended Period + References No definition available. + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + 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 (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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- Details
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