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Significant Accounting Policies (Details Textual) |  |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May. 01, 2024 | Oct. 23, 2014 USD ($) | Mar. 20, 2013 | Mar. 28, 2012 | Mar. 31, 2016 USD ($) Clients shares | Mar. 31, 2015 USD ($) Clients | Mar. 23, 2016 | Dec. 31, 2015 USD ($) Clients
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | $ (20,389,000) | $ (14,511,000) |  | $ (12,625,000)
Clients exceeding consolidated accounts receivable percentage | Clients |  |  |  |  | 0 |  |  | 0
Interest Rate Percentage On Senior Notes |  |  |  |  | 6.75% |  |  |
Put option noncontrolling interest impairment charge |  |  |  |  | $ 0 | $ 0 |  |
Cost Method Investments |  |  |  |  | $ 12,645,000 |  |  | $ 11,763,000
Consolidated Accounts Receivable Percentage |  |  |  |  |  |  |  | 10.00%
Clients exceeding consolidated largest client revenue | Clients |  |  |  |  | 0 | 0 |  |
Consolidated Largest Client Revenue |  |  |  |  | 10.00% | 10.00% |  |
Business Combination, Acquisition Related Costs |  |  |  |  | $ 553,000 | $ 874,000 |  |
Assets |  |  |  |  | 1,571,555,000 | 1,625,613,000 |  | $ 1,577,625,000
Liabilities |  |  |  |  | 2,025,764,000 |  |  | 1,995,227,000
Adjustment to deferred acquisition consideration included in interest expense |  |  |  |  | $ 112 | 554 |  |
Common Class A |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Aggregate Non-Vested, Shares, Restricted Stock Issued, Gross | shares |  |  |  |  | 1,376,388 |  |  |
Doner [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage |  |  |  | 30.00% |  |  |  |
Assets |  |  |  |  | $ 113,235,000 |  |  | 122,558,000
Liabilities |  |  |  |  | $ 77,668,000 |  |  | $ 86,047,000
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% |  |  |
Real Estate Joint Venture [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 30.00% |  |  |
Wells Fargo Capital Finance, LLC |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  | 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 |  |  |  |  | $ 6,327,000 | $ 2,248,000 |  |
Notes due 2020 [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 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% |  |  |
Six Point Five Zero Percentage Notes [Domain] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 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 |  |  |  |  | 111,500 |  |  |
Restricted stock grant date fair value |  |  |  |  | $ 2,018,000 |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares |  |  |  |  | 527,348 |  |  |
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 |  |  |  |  |  |  |

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