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Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash Flow Supplemental Disclosures [Line Items] |  |  |
Interest paid | $ 3,065 | $ 5,773 | $ 3,362
Income taxes net of refunds | 115,301 | $ 48,056 | $ 99,006
Common stock issued for Alert Labs Inc. | $ 6,846 |  |

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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