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Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flow Supplemental Disclosures [Line Items] |  |  |
Interest paid | $ 1,844 | $ 4,341 | $ 3,065
Income taxes net of refunds | 70,889 | 70,095 | 115,301
N&S Supply of Fishkill, Inc |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |
Business combination shares issued | $ (161) | 4,032 |
Peirce-Phelps, Inc. |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |
Business combination shares issued |  | 58,344 |
Dunphey & Associates Supply Co., Inc. |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |
Business combination shares issued |  | $ 6,891 |
Alert Labs Inc |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |
Business combination shares issued |  |  | $ 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=121583591&loc=d3e4297-108586 + Details
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