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Revenue - Additional Information (Detail) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Dec. 30, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Decrease to prepaid expenses and other current assets | $ (28,457) |  | $ (26,805)
Increase to deferred income tax liability | 204,304 |  | $ 143,591
Deferred revenue recognized | $ 67,090 |  |
Revenue, practical expedient, remaining performance obligation, description | contracts with an original expected length of one year or less. |  |
Revenue, remaining performance obligation, optional exemption, performance obligation | true |  |
Other Liabilities |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Long-term deferred revenue | $ 1,501 |  |
Accounting Standards Update 2014-09 | Retained Earnings |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Net increase to opening retained earnings |  | $ 2,145 |
Difference between Revenue Guidance in Effect Before and After Topic 606 | Accounting Standards Update 2014-09 |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Decrease to deferred revenue |  | 3,501 |
Decrease to prepaid expenses and other current assets |  | 568 |
Increase to deferred income tax liability |  | $ 788 |

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