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Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	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

X

- 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

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-Topic 230
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+ References

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Cash Flow Supplemental Disclosures [Line Items]

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