Clients exceeding consolidated accounts receivable percentage

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- Definition

Clients exceeding consolidated largest client revenue

+ References

No definition available.

+ Details

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- Definition

The percentage of accounts receivable that the largest client did not exceed during the period.

+ References

No definition available.

+ Details

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- Definition

The percentage of revenue over the consolidated revenue that the largest client did not exceed during the period.

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Maturity Year

+ References

No definition available.

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- Definition

This item represents the proceeds received in excess of carrying value on the sale of an investment.

+ References

No definition available.

+ Details

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- Definition

Equity Method Investment, Realized Gain (Loss) on Sale

+ References

No definition available.

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- Definition

Fair Value Inputs, Long-term Growth Rate

+ References

No definition available.

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- Definition

Maximum shares issuance restricted stock units and shares.

+ References

No definition available.

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- Definition

Number of Investments Sold

+ References

No definition available.

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- Definition

Option to purchase noncontrolling interest impairment charge

+ References

No definition available.

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

No definition available.

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Data Type:	num:perShareItemType
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Period Type:	duration

- References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are 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
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.18)
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 12
-Article 7

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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Period Type:	instant

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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-SubTopic 10
-Section 25
-Paragraph 23
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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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- Definition

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Subparagraph (SX 210.5-02.12)
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-Topic 325
-SubTopic 20
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594

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- Definition

This item represents the gain (loss) realized during the period from the sale of investments accounted for under the cost method of accounting and any losses recognized thereon for impairments of other than a temporary nature.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 2
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 9
-Article 5

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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Data Type:	xbrli:dateItemType
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- Definition

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 28
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 13
-Article 5

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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
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-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ 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 (bbb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of loss from the write-down of an 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
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-Paragraph 2
-Subparagraph (b)
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-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Period Type:	duration

- Definition

Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reporting Unit
-URI http://asc.fasb.org/extlink&oid=6523643

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- Definition

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 70
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-Paragraph 1
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-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

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- Definition

The cash inflow associated with the sale of other investments not otherwise defined in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

No definition available.

+ Details

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Percentage of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

+ Details

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 2
-Subparagraph (f)(2)(ii)
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 1
-Subparagraph (SAB TOPIC 14.D.2)
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section D
-Subsection 2

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Value, before forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

+ References

No definition available.

+ Details

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Number of new stock issued during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=52262685&loc=SL6759159-111685

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Significant Accounting Policies - Textual (Details)			3 Months Ended		12 Months Ended
Significant Accounting Policies - Textual (Details)	Mar. 20, 2013	Mar. 28, 2012	Dec. 31, 2015 USD ($) Clients	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) Clients investment	Dec. 31, 2014 USD ($) investment shares	Dec. 31, 2013 USD ($) $ / shares shares	Oct. 01, 2015	Apr. 02, 2014	Nov. 15, 2013
Significant Accounting Policies [Line Items]
Option to purchase noncontrolling interest impairment charge					$ 0
Clients exceeding consolidated accounts receivable percentage \| Clients			0		0
Number of Reporting Units					13	10
Consolidated accounts receivable percentage			10.00%	10.00%	10.00%	10.00%
Clients exceeding consolidated largest client revenue \| Clients					0
Consolidated largest client revenue					10.00%	10.00%	10.00%
Equity method investment, realized gain (loss) on disposal					$ 0	$ 0	$ 3,058,000
Cost method investments			$ 11,763,000	$ 10,196,000	11,763,000	10,196,000
Cost-method Investments, Realized Gain (Loss)					5,440
Goodwill, Impairment Loss					0
Business combination, acquisition related costs					2,912,000	6,133,000	2,066,000
Assets			1,590,250,000	1,648,890,000	1,590,250,000	1,648,890,000	$ 1,425,227,000
Liabilities			$ 2,007,852,000	1,802,519,000	2,007,852,000	$ 1,802,519,000
Stock Issued During Period, Shares, New Issues \| shares						0	0
Allocated Share-based Compensation Expense					17,796,000	$ 17,696,000	$ 100,405,000
Pension expense					6,731,000	7,503,000	$ 6,145,000
Proceeds from Sale of Equity Method Investments					2,094
Equity Method Investment, Realized Gain (Loss) on Disposal					$ 1,086
Discounted Cash Flow Assumption, Long-term Growth Rate, Percent					3.00%
Equity Value Appreciation Awards
Significant Accounting Policies [Line Items]
Maximum shares issuance restricted stock units and shares \| shares							1,917,000
Risk free interest rate							1.20%
Expected volatility rate							31.70%
Expected term							2 years 11 months 5 days
Weighted average grant date fair value \| $ / shares							$ 9.37
Performance Shares
Significant Accounting Policies [Line Items]
Share-based compensation, gross					$ 1,741	3,026	$ 2,699
Real Estate Joint Venture [Member]
Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage			30.00%		30.00%
Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life					3 years
Fair Value Inputs, Discount Rate					8.92%
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount								7.00%
Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life					7 years
Equity method investment, ownership percentage			50.00%		50.00%
Fair Value Inputs, Discount Rate					11.95%
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount								100.00%
Doner
Significant Accounting Policies [Line Items]
Variable interest entity, qualitative or quantitative information, ownership percentage		30.00%
Assets			$ 122,558,000	223,305,000	$ 122,558,000	223,305,000
Liabilities			86,047,000	192,340,000	86,047,000	192,340,000
Doner \| Aggregate 2012 Acquisitions
Significant Accounting Policies [Line Items]
Ownership interest percentage increase on exercise of option		70.00%
Real Estate Joint Venture [Member]
Significant Accounting Policies [Line Items]
Distributions from non-consolidated affiliates							3,096
Equity method investment, realized gain (loss) on disposal							3,058
Contingent Payment [Member]
Significant Accounting Policies [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			$ 41,910	$ 1,751	$ 36,344,000	$ 16,467,000	$ 35,914,000
Six Point Seven Five Percentage Notes [Member]
Significant Accounting Policies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.75%		6.75%	6.75%	6.75%	6.75%	6.75%		6.75%	6.75%
Debt Instrument, Maturity Year	2020
Debt Instrument, Maturity Date	Apr. 01, 2020
Interest Expense [Member] \| Fixed Payment [Member]
Significant Accounting Policies [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability					$ 2,543,000	$ 2,186,000	$ 232,000
Equity Method Investments [Member]
Significant Accounting Policies [Line Items]
Number of investments sold \| investment					1
Cost-method Investments [Member]
Significant Accounting Policies [Line Items]
Number of investments sold \| investment					6	2
Proceeds from sale of other investments					$ 11,364	$ 8,248,000
Qualitative Assessment [Member]
Significant Accounting Policies [Line Items]
Number of Reporting Units						3
Quantitative Assessment [Member]
Significant Accounting Policies [Line Items]
Number of Reporting Units					13	7