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Acquisitions - Additional Information (Detail) $ in Thousands		1 Months Ended	9 Months Ended
	Aug. 01, 2019 USD ($) Location shares	Apr. 02, 2019 USD ($) Location shares	Sep. 30, 2019 USD ($)
Business Acquisition [Line Items]
Proceeds from non-controlling interest for Business Acquisition			$ 17,000
Peirce Phelps PPI [Member]
Business Acquisition [Line Items]
Number of locations in which the company operates | Location	19
Business combination recognized identifiable assets acquired and liabilities assumed net	$ 85,000
Business combination cash transferred	$ 10,000
Number of shares issuable | shares	372,543
Fair value of equity shares issued or issuable	$ 58,638		58,638
Proceeds from non-controlling interest for Business Acquisition	17,000
Preliminary fair value estimate of working capital acquired	$ 59,000
Dunphey Associates Supply Co [Member]
Business Acquisition [Line Items]
Number of locations in which the company operates | Location		7
Business combination cash transferred		$ 16,781
Fair value of equity shares issued or issuable		$ 7,450	$ 7,450
Stock issued for acquisition | shares		50,952

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