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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 | Apr. 01, 2017 | May 03, 2016 | Mar. 23, 2016 | Oct. 23, 2014 USD ($) | Mar. 28, 2012 | Sep. 30, 2017 USD ($) Clients shares | Mar. 31, 2017 shares | Sep. 30, 2016 USD ($) Clients | Sep. 30, 2017 USD ($) Clients shares | Sep. 30, 2016 USD ($) Clients | Dec. 31, 2016 USD ($) Clients shares | Jan. 31, 2017 $ / shares shares | Dec. 31, 2015 USD ($) | Mar. 20, 2013
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Liability, Prior Period Correction |  |  |  |  |  |  |  |  |  |  |  | $ 6,916 |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  |  |  |  |  |  |  | $ 1,390 |  | $ 713 |  |  |  |
Increase (Decrease) in Book Overdrafts |  |  |  |  |  |  |  |  |  | $ 17,532,000 |  |  |  |  |
Stock Issued During Period, Shares, Convertible Preferred Shares | shares |  |  |  |  |  |  |  |  |  | 90,220,000 |  |  |  |  |
Redeemable noncontrolling interests |  |  |  |  |  |  | $ 60,092,000 |  |  | $ 60,092,000 |  | 60,180,000 |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  |  |  | 337,000 |  | 520,000 | 9,650,000 |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  |  |  |  |  | 2,315,000 | 22,498,000 |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | $ (18,161,000) |  |  | $ (18,161,000) |  | $ (18,420,000) |  |  |
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 |  |  |  |  |  |  | $ 10,350,000 |  |  | $ 10,350,000 |  | $ 10,132,000 |  |  |
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% |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  | $ 216,000 |  | $ 806,000 | $ 693,000 | $ 2,266,000 |  |  |  |
Assets |  |  |  |  |  |  | 1,617,831,000 |  |  | 1,617,831,000 |  | $ 1,577,378,000 |  |  |
Liabilities |  |  |  |  |  |  | 1,946,673,000 |  |  | 1,946,673,000 |  | 2,026,674,000 |  |  |
Restricted stock grant date fair value |  |  |  |  |  |  |  |  |  | 27,852,000 |  |  |  |  |
Adjustment to deferred acquisition consideration included in interest expense |  |  |  |  |  |  | 24,000 |  | 30,000 | 77,000 | 181,000 |  |  |  |
Goodwill |  |  |  |  |  |  | 839,361,000 |  |  | 839,361,000 |  | 844,759,000 |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  | 0 |  | 29,631,000 | 0 | 29,631,000 |  |  |  |
Goodwill, Written off Related to Sale of Business Unit |  |  |  |  |  |  |  |  |  | 17,593,000 | 764,000 |  |  |  |
Doner [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage |  | 45.00% |  |  |  | 30.00% |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  | 100,229,000 |  |  | 100,229,000 |  | 102,456,000 |  |  |
Liabilities |  |  |  |  |  |  | $ 53,508,000 |  |  | 53,508,000 |  | 57,622,000 |  |  |
Doner [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest Percentage Increase On Exercise Of Option |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate 2012 Acquisitions [Member] | Doner [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest Percentage Increase On Exercise Of Option |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |
Aggregate 2017 Step Up Transactions [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  |  |  |  |  |  | 11,965 |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  |  |  |  |  | $ 2,316 |  |  |  |  |
Aggregate 2017 Step Up Transactions [Domain] | Doner [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest Percentage Increase On Exercise Of Option |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | $ (2,462,000) |  | $ 11,152,000 | $ 12,152,000 | $ 17,180,000 |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 243,000 |  |  |  |  |
Restricted stock grant date fair value |  |  |  |  |  |  |  |  |  | $ 1,966,000 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 19,354 |  |  |
Redeemable Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interests |  |  |  |  |  |  | $ 60,092,000 |  |  | 60,092,000 |  | 60,180,000 |  | $ 69,471,000 |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  |  |  |  |  |  | 816,000 |  | 1,708,000 |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  |  |  |  |  | 0 |  | 2,274,000 |  |  |
Changes in redemption value |  |  |  |  |  |  |  |  |  | 299,000 |  | (9,604,000) |  |  |
Redeemable Noncontrolling Interest Currency Adjustments |  |  |  |  |  |  |  |  |  | 429,000 |  | $ (253,000) |  |  |
Stock Incentive Plan 2011 [Member] | Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  |  |  |  |  |  |  |  |  |  |  |  | 327,500 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.60 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options |  |  |  |  |  |  | $ 770,000 |  |  | $ 770,000 |  |  |  |  |
Stock Incentive Plan 2011 [Member] | Contingent Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares |  |  |  |  |  |  |  |  |  | 930,600 |  |  |  |  |
Stock Incentive Plan 2016 [Member] | Contingent Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | shares |  |  |  |  |  |  | 513,321 |  |  | 513,321 |  |  |  |  |
Preferred Stock [Member] | Series 4 Convertible Preferred Stock [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Convertible Preferred Shares | shares |  |  |  |  |  |  |  | 95,000 |  | 95,000 |  | 0 |  |  |

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- Definition Clients exceeding consolidated accounts receivable percentage + References No definition available. + Details
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