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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 21, 2018 USD ($) | Jan. 23, 2018 USD ($) $ / shares shares | Jan. 04, 2018 | Jan. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) segment $ / shares shares | Mar. 31, 2017 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) $ / shares shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  | 1 |  |  |
Stock split, conversion ratio |  |  | 1.681 |  |  |  |  |
Noncurrent restricted cash and cash equivalents |  |  |  |  | $ 750,000 |  |  |
Subscriber system assets, depreciation expense |  |  |  |  | 136,000 | $ 133,000 |  |
Money market funds |  |  |  |  | 145,000 |  |  | $ 51,000
Guarantor obligations, current carrying value |  |  |  |  | 55,000 |  |  | 54,000
Amount awarded from other party |  |  |  | $ 10,000 |  |  |  |
Settlement non-cash amount |  |  |  |  | 7,500 |  |  |
Settlement cash amount |  |  |  |  | $ 24,000 |  |  |
Payment term |  |  |  |  | 48 months |  |  |
Term of customer relationship |  |  |  |  | 15 years |  |  |
Retained earnings (accumulated deficit) |  |  |  |  | $ (1,148,059) |  | $ (963,782) | (998,212)
Deferred tax liabilities |  |  |  |  | $ 1,381,723 |  | 1,388,594 | $ 1,376,708
Mandatorily redeemable preferred securities outstanding (in shares) | shares |  |  |  |  | 750,000 |  |  | 750,000
Mandatorily redeemable preferred securities par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.01 |  |  | $ 0.01
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Retained earnings (accumulated deficit) |  |  |  |  | $ 39,535 |  | 34,430 |
Deferred tax liabilities |  |  |  |  | $ 13,543 |  | $ 11,886 |
Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Contract term |  |  |  |  | 3 years |  |  |
Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Contract term |  |  |  |  | 5 years |  |  |
Senior Notes | Prime Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of senior debt | $ 649,000 |  |  |  |  |  |  |
Repurchased face amount | $ 594,000 |  |  |  |  |  |  |
Interest rate | 9.25% |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | $ 2,546,000 |  |  |
IPO |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Shares issued in public offering (in shares) | shares |  | 105,000,000 |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares |  | $ 14.00 |  |  |  |  |  |
Proceeds from initial public offering |  | $ 1,415,000 |  |  |  |  |  |
Stock issuance expense |  | 10,000 |  |  |  |  |  |
Stock issuance expense incurred but not yet paid |  | $ 5,000 |  |  |  |  |  |
Mandatorily Redeemable Preferred Stock |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Mandatorily redeemable preferred securities outstanding (in shares) | shares |  |  |  |  | 750,000 |  |  |

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