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Significant Accounting Policies (Details Textual) |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
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May 01, 2024 | May 03, 2016 | Mar. 23, 2016 | Oct. 23, 2014 USD ($) | Mar. 28, 2012 | Sep. 30, 2016 USD ($) Clients shares | Sep. 30, 2015 USD ($) Clients | Sep. 30, 2016 USD ($) Clients shares | Sep. 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 |  |  |  |  |  | $ 60,174,000 |  | $ 60,174,000 |  | $ 69,471,000 |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  |  |  | 8,819,000 |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | $ (19,343,000) | $ (13,254,000) | $ (19,343,000) | $ (13,254,000) | $ (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 |  |  |  |  |  | $ 10,607,000 |  | $ 10,607,000 |  | $ 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 |  |  |  |  |  | $ 806,000 | $ 728,000 | $ 2,266,000 | $ 2,444,000 |  |  |
Assets |  |  |  |  |  | 1,642,312,000 | 1,603,946,000 | 1,642,312,000 | 1,603,946,000 | $ 1,577,625,000 |  |
Liabilities |  |  |  |  |  | 2,094,019,000 |  | 2,094,019,000 |  | 1,995,227,000 |  |
Adjustment to deferred acquisition consideration included in interest expense |  |  |  |  |  | 30,000 | 770,000 | 181,000 | 1,700,000 |  |  |
Goodwill, Impairment Loss |  |  |  |  |  | 29,631,000 | 0 | 29,631,000 | 0 |  |  |
Goodwill, Written off Related to Sale of Business Unit |  |  |  |  |  | $ (764,000) |  | $ 764,000 |  |  |  |
Common Class A |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Non-Vested, Shares, Restricted Stock Issued, Gross | shares |  |  |  |  |  | 1,404,081 |  | 1,404,081 |  |  |  |
Doner [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage |  |  |  |  | 30.00% |  |  |  |  |  |  |
Assets |  |  |  |  |  | $ 99,047,000 |  | $ 99,047,000 |  | 122,558,000 |  |
Liabilities |  |  |  |  |  | $ 52,381,000 |  | $ 52,381,000 |  | 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% |  |
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 |  |  |  |  |  | $ 11,152,000 | $ 4,928,000 | $ 17,180,000 | $ (5,566,000) |  |  |
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 |  |  |  |  |  |  |  | 296,000 |  |  |  |
Restricted stock grant date fair value |  |  |  |  |  |  |  | $ 4,454,000 |  |  |  |
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 |  |  |  |  |  |  |  | $ 19,194 |  |  |  |
Redeemable Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Fair Value |  |  |  |  |  | $ 60,174,000 |  | 60,174,000 |  | $ 69,471,000 | $ 194,951,000 |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  |  |  |  | 890,000 |  | 155,042,000 |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  |  |  | 2,274,000 |  | 7,703,000 |  |
Changes in redemption value |  |  |  |  |  |  |  | (10,626,000) |  | 22,809,000 |  |
Redeemable Noncontrolling Interest Currency Adjustments |  |  |  |  |  |  |  | $ (55,000) |  | $ (950,000) |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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