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Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 01, 2019 | Apr. 02, 2019 | Nov. 26, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash Flow Supplemental Disclosures [Line Items] |  |  |  |  |  |
Interest paid |  |  |  | $ 4,341 | $ 3,065 | $ 5,773
Income taxes net of refunds |  |  |  | 70,095 | 115,301 | $ 48,056
N&S Supply of Fishkill, Inc |  |  |  |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |  |  |  |
Business combination shares issued |  |  | $ 4,032 | 4,032 |  |
Peirce-Phelps, Inc. |  |  |  |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |  |  |  |
Business combination shares issued | $ 58,344 |  |  | 58,344 |  |
Dunphey & Associates Supply Co., Inc. |  |  |  |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |  |  |  |
Business combination shares issued |  | $ 6,891 |  | $ 6,891 |  |
Alert Labs Inc |  |  |  |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |  |  |  |
Business combination shares issued |  |  |  |  | $ 6,846 |

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