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New Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income tax benefit, excess tax deductions for stock-based compensation |  | $ 6,300 |  |
Deferred tax assets, stock-based compensation expense | $ 8,998 | 15,038 |  |
Deferred tax assets valuation allowance | 89,508 | 113,699 |  |
Net cash provided by operating activities | 352,794 | 477,812 | $ 407,960 |
Net cash provided by (used in) financing activities | $ 1,272,130 | (207,040) | (339,930) |
ASU 2016-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Deferred tax assets, stock-based compensation expense |  |  |  | $ 15,400
Deferred tax assets valuation allowance |  |  |  | $ 15,400
Net cash provided by operating activities |  |  | 6,900 |
Net cash provided by (used in) financing activities |  |  | (6,900) |
ASU 2016-05 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cash provided by operating activities |  | 18,000 |  |
Net cash provided by (used in) financing activities |  | (18,000) |  |
ASU 2016-18 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cash provided by operating activities |  | $ 700 | $ (3,800) |

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