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Fair Value Measurements - Recurring and Nonrecurring Basis (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge | $ 0 |  | $ (5,413) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (5,413) |  | $ 0 | $ 0
Money market funds |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 118 |  |  |  |  | 10,177 |  |  |  | 118 |  | 10,177 |
Other mutual funds |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 2,023 |  |  |  |  | 1,239 |  |  |  | 2,023 |  | 1,239 |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 2,141 |  |  |  |  | 11,416 |  |  |  | 2,141 |  | 11,416 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 2,141 |  |  |  |  | 11,416 |  |  |  | 2,141 |  | 11,416 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 118 |  |  |  |  | 10,177 |  |  |  | 118 |  | 10,177 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Other mutual funds |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 2,023 |  |  |  |  | 1,239 |  |  |  | 2,023 |  | 1,239 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 0 |  |  |  |  | 0 |  |  |  | 0 |  | 0 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Money market funds |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 0 |  |  |  |  | 0 |  |  |  | 0 |  | 0 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other mutual funds |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 0 |  |  |  |  | 0 |  |  |  | 0 |  | 0 |
Fair Value, Measurements, Recurring | Significant Unobserved Inputs (Level 3) |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 0 |  |  |  |  | 0 |  |  |  | 0 |  | 0 |
Fair Value, Measurements, Recurring | Significant Unobserved Inputs (Level 3) | Money market funds |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 0 |  |  |  |  | 0 |  |  |  | 0 |  | 0 |
Fair Value, Measurements, Recurring | Significant Unobserved Inputs (Level 3) | Other mutual funds |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 0 |  |  |  |  | 0 |  |  |  | 0 |  | 0 |
Fair Value, Measurements, Nonrecurring |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Fair Value Disclosure | 0 |  |  |  |  |  |  |  |  | 0 |  |  |
Property, Plant, and Equipment, Fair Value Disclosure | 0 | [1] |  |  |  |  |  |  |  | 0 | [1] |  |
Assets | 0 |  |  |  |  |  |  |  |  | 0 |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  | (5,413) |  |  |
Fair Value, Measurements, Nonrecurring | Goodwill (1) |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  | (4,461) |  |  |
Fair Value, Measurements, Nonrecurring | Property and equipment(1) |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  | (952) | [1] |  |
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets (Level 1) |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Fair Value Disclosure | 0 |  |  |  |  |  |  |  |  | 0 |  |  |
Property, Plant, and Equipment, Fair Value Disclosure | 0 | [1] |  |  |  |  |  |  |  | 0 | [1] |  |
Assets | 0 |  |  |  |  |  |  |  |  | 0 |  |  |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Fair Value Disclosure | 0 |  |  |  |  |  |  |  |  | 0 |  |  |
Property, Plant, and Equipment, Fair Value Disclosure | 0 | [1] |  |  |  |  |  |  |  | 0 | [1] |  |
Assets | 0 |  |  |  |  |  |  |  |  | 0 |  |  |
Fair Value, Measurements, Nonrecurring | Significant Unobserved Inputs (Level 3) |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value information related to assets |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Fair Value Disclosure | 0 |  |  |  |  |  |  |  |  | 0 |  |  |
Property, Plant, and Equipment, Fair Value Disclosure | 0 | [1] |  |  |  |  |  |  |  | 0 | [1] |  |
Assets | $ 0 |  |  |  |  |  |  |  |  | $ 0 |  |  |
[1] | See Notes 5 and 7 for details of the impairment charges.

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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X
- Definition Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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