Acquisition - Additional Information (Details) - USD ($)		3 Months Ended	6 Months Ended
	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2017
Senior Notes [Member] | 3.22% Senior Unsecured Promissory Note Payable [Member]
Business Acquisition [Line Items]
Debt issuance, aggregate principal amount	$ 60,000,000	$ 60,000,000	$ 60,000,000
Manufacturers Supply Company [Member]
Business Acquisition [Line Items]
Purchase price paid in cash at closing	57,900,000
Purchase price paid in cash after closing		800,000
Maximum contingent consideration arrangement	$ 2,500,000
Fair value of contingent consideration arrangement		$ 600,000	600,000
Total consideration including fair value of contingent consideration arrangement			$ 59,300,000