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Significant Accounting Policies (Details Textual) |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
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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) |  |

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