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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
	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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Cash equivalent, maturity period.

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Maximum Customer Account Of Revenue

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Number Of Reporting Segments

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Property Plant And Equipment Useful Life Description

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Test Percentage Of Indefinite Lived Intangible Assets

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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.

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-Publisher FASB

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-Number 159

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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-Glossary Cash Equivalents

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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