Adjustment to deferred acquisition consideration included in interest expense

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Aggregate Non-Vested, Shares, Restricted Stock Grant, Gross

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Clients exceeding consolidated accounts receivable percentage

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Clients exceeding consolidated largest client revenue

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

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

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Percentage of interest rate payable on senior notes.

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Option to purchase noncontrolling interest impairment charge

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Adjustments to redeemable noncontrolling interest resulting from foreign currency translation adjustments.

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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.

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

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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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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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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.

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

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

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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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.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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Amount of increase in noncontrolling interest from a business combination.

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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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The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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Number of new stock issued during the period.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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

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Significant Accounting Policies (Details Textual)						3 Months Ended		6 Months Ended		12 Months Ended
Significant Accounting Policies (Details Textual)	May 01, 2024	May 03, 2016 USD ($)	Mar. 23, 2016	Oct. 23, 2014	Mar. 28, 2012	Jun. 30, 2016 USD ($) Clients shares	Jun. 30, 2015 USD ($) Clients	Jun. 30, 2016 USD ($) Clients shares	Jun. 30, 2015 USD ($) Clients	Dec. 31, 2015 USD ($) Clients	Dec. 31, 2014 USD ($)	Mar. 20, 2013
Significant Accounting Policies [Line Items]
Redeemable Noncontrolling Interest, Equity, Fair Value						$ 65,367,000		$ 65,367,000		$ 69,471,000
Noncontrolling Interest, Increase from Business Combination								3,844,000
Debt Issuance Costs, Net						$ (20,059,000)	$ (13,882,000)	$ (20,059,000)	$ (13,882,000)	$ (12,625,000)
Clients exceeding consolidated accounts receivable percentage \| Clients						0		0		0
Interest Rate Percentage On Senior Notes						6.75%		6.75%
Put option noncontrolling interest impairment charge						$ 0	$ 0	$ 0	$ 0
Cost Method Investments						$ 13,106,000		$ 13,106,000		$ 11,763,000
Consolidated Accounts Receivable Percentage						10.00%		10.00%		10.00%
Clients exceeding consolidated largest client revenue \| Clients						0	0	0	0
Consolidated Largest Client Revenue						10.00%	10.00%	10.00%	10.00%
Business Combination, Acquisition Related Costs						$ 907,000	$ 842,000	$ 1,460,000	$ 1,716,000
Assets						1,616,153,000	1,834,765,000	1,616,153,000	1,834,765,000	$ 1,577,625,000
Liabilities						2,073,499,000		2,073,499,000		1,995,227,000
Adjustment to deferred acquisition consideration included in interest expense						$ 40,000	377,000	$ 152,000	930,000
Common Class A
Significant Accounting Policies [Line Items]
Aggregate Non-Vested, Shares, Restricted Stock Issued, Gross \| shares						1,237,611		1,237,611
Doner [Member]
Significant Accounting Policies [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage					30.00%
Assets						$ 93,723,000		$ 93,723,000		122,558,000
Liabilities						$ 48,010,000		$ 48,010,000		86,047,000
Aggregate 2015 Step Up Transactions [Member]
Significant Accounting Policies [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests										149,335
Aggregate 2012 Acquisitions [Member] \| Doner [Member]
Significant Accounting Policies [Line Items]
Ownership Interest Percentage Increase On Exercise Of Option					70.00%
Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life								3 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life								7 years
Equity Method Investment, Ownership Percentage						50.00%		50.00%
Real Estate Joint Venture [Member]
Significant Accounting Policies [Line Items]
Equity Method Investment, Ownership Percentage						30.00%		30.00%
Wells Fargo Capital Finance, LLC
Significant Accounting Policies [Line Items]
Debt Instrument, Maturity Date		May 03, 2021		Sep. 30, 2019
Line of Credit Facility, Maximum Borrowing Capacity		$ 325,000,000
Contingent payment [Domain]
Significant Accounting Policies [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability						$ (299,000)	$ (12,741,000)	$ 6,028,000	$ (10,493,000)
Notes due 2020 [Member]
Significant Accounting Policies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						6.75%		6.75%
Six Point Seven Five Percentage Notes [Member]
Significant Accounting Policies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage												6.75%
Six Point Seven Five Percentage Notes [Member] \| Wells Fargo Capital Finance, LLC
Significant Accounting Policies [Line Items]
Debt Instrument, Maturity Date			Apr. 01, 2020
Notes due 2024 [Domain]
Significant Accounting Policies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						6.50%		6.50%
Six Point Five Zero Percentage Notes [Domain]
Significant Accounting Policies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.50%			6.50%		6.50%
Restricted Stock Units (RSUs) [Member] \| Common Class A
Significant Accounting Policies [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross \| shares								122,500
Restricted stock grant date fair value								$ 2,241,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross \| shares								523,321
Scenario, Forecast [Member] \| Six Point Five Zero Percentage Notes [Domain]
Significant Accounting Policies [Line Items]
Debt Instrument, Maturity Date	May 01, 2024
Scenario, Forecast [Member] \| Six Point Five Zero Percentage Notes [Domain] \| Wells Fargo Capital Finance, LLC
Significant Accounting Policies [Line Items]
Debt Instrument, Maturity Date	May 01, 2024
Noncontrolling Interest Equity [Domain] \| Aggregate 2016 Step Up Transactions [Member]
Significant Accounting Policies [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests								$ 19,174
Redeemable Noncontrolling Interest [Member]
Significant Accounting Policies [Line Items]
Redeemable Noncontrolling Interest, Equity, Fair Value						$ 65,367,000		65,367,000		69,471,000	$ 194,951,000
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests								0		155,042,000
Noncontrolling Interest, Increase from Business Combination								0		7,703,000
Changes in redemption value								(4,141,000)		22,809,000
Redeemable Noncontrolling Interest Currency Adjustments								$ 37,000		$ (950,000)