Significant Accounting Policies (Details)	12 Months Ended
Dec. 31, 2013 deliverable category
Principles of consolidation
Voting interest model percentage of voting interest for consolidation greater than (as a percent)	50.00%
Revenue recognition
Maximum period of customer obligations (in years)	1 year
Number of deliverables per unit of accounting for deferral of all revenue, greater than	1
Number of categories for each segment in which total revenues are reported	2
Cash equivalents
Maximum original maturity period of short-term liquid investments considered as cash equivalents (in days)	90 days
Client funds obligations
Client funds obligations, maximum repayment period (in years)	1 year
Maximum
Investment [Line Items]
Cost method investment ownership percentage	20.00%
Unconsolidated real estate affiliates
Investment [Line Items]
Ownership percentage	50.00%
Investments in securities, significant influence/noncontrolling voting interest \| Minimum
Investment [Line Items]
Ownership percentage	20.00%
Investments in securities, partnership and similar investment interests \| Minimum
Investment [Line Items]
Ownership percentage	5.00%

Represents the maximum original maturity period of short-term liquid investments classified as cash equivalents.

No definition available.

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- Definition

The maximum repayment period for client funds obligations as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Represents the maximum period of the entity's customer obligations in connection with goods and services provided.

+ References

No definition available.

+ Details

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- Definition

Represents the number of categories for each segment in which the entity's total revenues are reported.

+ References

No definition available.

+ Details

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- Definition

For units of accounting with more than this number of deliverables, all revenues are deferred until the period over which the last undelivered item is delivered.

+ References

No definition available.

+ Details

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- Details

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- Definition

Under the voting interest model, the investor that has voting control greater this percentage of the entity's voting interests consolidates the entity.

+ References

No definition available.

+ Details

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- Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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