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Acquisitions - Summary of Preliminary Allocation of Purchase Price to Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 03, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Assets: |  |  |
Goodwill | $ 242,543 |  | $ 85,165
SiriusDecisions, Inc [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents |  | $ 7,858 |
Accounts receivable |  | 18,981 |
Prepaids and other current assets |  | 3,786 |
Fixed assets |  | 4,169 |
Goodwill |  | 157,808 |
Acquired intangible assets |  | 116,000 |
Other assets |  | 265 |
Total assets |  | 308,867 |
Liabilities: |  |  |
Accounts payable and accrued liabilities |  | 9,251 |
Deferred revenue |  | 26,244 |
Deferred tax liability |  | 24,460 |
Long-term deferred revenue |  | 1,037 |
Other long-term liabilities |  | 1,073 |
Total liabilities |  | 62,065 |
Net assets acquired |  | $ 246,802 |

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