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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 Segment | Dec. 31, 2011 | Dec. 31, 2010
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Reporting business segments | 2 |  |
Ownership percentage | 50.00% |  |
Cash invested in money market funds, outstanding balances |  | $ 42.5 |
Cash equivalent, maturity period | Three months or less |  |
Reserve for uncollectible accounts | 6.7 | 7.7 |
Minimum percentage of revenue accounted for by one customer | 10.00% | 10.00% | 10.00%
State tax net operating losses, valuation allowance | $ 0.1 |  |
Minimum |  |  |
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of likelihood of impairment test for indefinite lived intangibles | 50.00% |  |
Building And Improvement | Maximum |  |  |
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated life | 40 years |  |
Computer Equipment And Software | Maximum |  |  |
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated life | 5 years |  |
Furniture And Equipment | Maximum |  |  |
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated life | 10 years |  |
Transportation Equipment And Automobiles | Maximum |  |  |
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated life | 15 years |  |
Software Development | Maximum |  |  |
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets estimated useful life | 5 years |  |
Leasehold Improvements |  |  |
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated life, description | The shorter of useful life or lease term. |  |

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + 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=7512638&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 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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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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