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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |  |  |
Provisional deferred tax benefit due to tax cuts and jobs act of 2017 |  | $ 158,286 | $ 0 | $ 0 |
Provisional transition tax obligation for repatriation of foreign earnings |  | 144,167 | 0 | 0 |
Initial income tax benefit due to tax cuts and jobs act of 2017 |  | 14,000 |  |  |
Reduction in current income tax payable attributable to stock-based compensation |  | 100,000 | 76,000 | $ 130,000 |
Valuation allowance |  | (76,280) | $ (65,516) |  |
Decrease in NOL valuation allowance |  | 10,000 |  |  |
Effective interest rate of federal statutory income tax rate |  |  | 35.00% | 35.00% |
Unrecognized tax benefits |  | 260,919 | $ 220,532 | $ 171,177 | $ 110,561
Unrecognized tax benefits that would impact effective tax rate |  | 155,000 | 181,000 |  |
Uncertain tax positions, interest and penalties |  | 22,000 | 15,000 |  |
Interest and penalties |  | 7,000 | $ 5,000 | $ 3,000 |
Federal |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | 65,000 |  |  |
State |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | 210,000 |  |  |
Foreign |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | 370,000 |  |  |
Indefinite foreign net operating loss carryforwards |  | 253,000 |  |  |
Foreign net operating loss carryforwards subject to expiration |  | $ 117,000 |  |  |
IRS |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Increase in prior years taxable revenue due to tax examination | $ 105,000 |  |  |  |
Additional federal tax expense due to tax examination | $ 37,000 |  |  |  |

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