|
Property and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
| Property, Plant and Equipment [Line Items] | |||
| Depreciation expense for continuing operations | $ 67.4 | $ 73.3 | $ 70.8 |
| Depreciation expense for discontinued operations | 4.4 | 6.1 | 7.6 |
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Leased Facilities And Equipment [Member]
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| Property, Plant and Equipment [Line Items] | |||
| Asset impairment charges | 2.7 | ||
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Leased Facilities [Member]
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| Property, Plant and Equipment [Line Items] | |||
| Asset impairment charges | 2.7 | 1.0 | |
|
Property and Equipment [Member]
|
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| Property, Plant and Equipment [Line Items] | |||
| Asset impairment charges | 8.0 | 29.5 | |
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Teach Out Schools [Member]
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| Property, Plant and Equipment [Line Items] | |||
| Asset impairment charges | $ 2.6 | $ 28.5 | |