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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2018 | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) reportable_segment | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Capitalized Contract Cost, Amortization |  | $ 20,000 | $ 14,000 | $ 37,760 | $ 27,152 |
Number of operating segments | reportable_segment |  |  |  | 1 |  |
Money market funds |  |  |  |  |  | $ 221,000
Guarantor obligations, current carrying value |  | 57,000 |  | $ 57,000 |  | 54,000
Revenue from Contract with Customer, Term of Customer Relationship |  |  |  | 15 years |  |
Retained earnings (accumulated deficit) |  | (1,904,242) |  | $ (1,904,242) |  | (1,680,432)
Deferred tax liabilities |  | $ 1,287,589 |  | $ 1,287,589 |  | $ 1,342,168
Litigation settlement, payment term | 48 months |  |  |  |  |

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