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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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- Definition

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

+ References

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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.

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+ References

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