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Investments Fair Value Option Investment (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 14, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Feb. 01, 2017
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |
Assets, Current |  | $ 816,796 |  | $ 816,796 |  | $ 1,091,936 |
Revenue |  | 634,466 | $ 686,555 | 1,970,711 | $ 2,108,750 |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | (3,955) | (1,594) | (5,100) | (7,301) |  |
Gross Profit |  | 309,425 | 293,268 | 946,943 | 928,747 |  |
Other Assets, Noncurrent |  | 17,302 |  | 17,302 |  | 23,484 |
Liabilities, Current |  | 948,758 |  | 948,758 |  | 1,213,051 |
Liabilities, Noncurrent |  | 102,386 |  | 102,386 |  | 99,628 |
GroupMax [Member] |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |
Equity method investments |  | 300 |  | 300 |  | 3,900 |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | (200) | (3,900) | (3,600) | (8,200) |  |
Monster LP [Member] |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |
Equity method investments |  | 77,200 |  | 77,200 |  | $ 78,700 |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | $ 3,800 | 2,300 | $ 1,500 | $ 900 |  |
Fair Value Inputs, Discount Rate |  |  |  | 22.00% |  | 22.00% |
Fair-Value Option Investments, Recapitalization Transaction, Ownership Percentage |  |  |  |  |  |  | 9.00%
Monster LP [Member] |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  |  | $ (1,594) |  |  |  |
Capital Unit, Class B [Member] | Monster LP [Member] |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |
Fair-Value Option Investment, Recapitalization Transaction, Shares Exchanged | 61,484,539 |  |  |  |  |  |
Capital Unit, Class A-1 [Member] | Monster LP [Member] |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |
Fair-Value Option Investment, Recapitalization Transaction, Shares Issued | 16,609,195 |  |  |  |  |  |
Fair-Value Option Investments, Recapitalization Transaction, Ownership Percentage |  |  |  |  |  |  | 57.00%
Fair-Value Option Investments, Recapitalization Transaction, Liquidation Preference | $ 85,000 |  |  |  |  |  |
All Equityholders [Member] | Capital Unit, Class A-1 [Member] | Monster LP [Member] |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |
Fair-Value Option Investments, Recapitalization Transaction, Liquidation Preference | $ 150,000 |  |  |  |  |  |
Minimum [Member] | Capital Unit, Class A-1 [Member] | Monster LP [Member] |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |
Stock or Units Available for Distributions | 950,000,000 |  |  |  |  |  |
Maximum [Member] | Capital Unit, Class A-1 [Member] | Monster LP [Member] |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |
Stock or Units Available for Distributions | 1,494,000,000 |  |  |  |  |  |

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