Disposal of Businesses - Additional Information (Details) - USD ($)			3 Months Ended		12 Months Ended
	Dec. 18, 2017	Feb. 17, 2015	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Notes receivable, carrying value				$ 18,737,000	$ 0	$ 18,737,000
Provision for loss on note receivable					23,008,000	0	$ 0
Interest income on notes receivable					$ 1,221,000	1,361,000	1,262,000
Maximum [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Interest rate					5.45%
Minimum [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Interest rate					4.67%
Brazil Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Consideration received for discontinued operation	$ 1
Additional amounts due, or to be settled	0
Gain (Loss) on sale of Business				(35,000,000)
Cash held by discontinued business				1,200,000		1,200,000
Cost incurred to sell business				300,000
U.S. tax benefit as a result of a worthless stock deduction	$ 15,000,000				$ 700,000
Worthless stock deduction on federal tax payments					4,300,000
Brazil Business [Member] | Maximum [Member] | Factoring Arrangement [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Guarantee obligation amount until December 31, 2019					7,000,000
Brazil Business [Member] | Level 3 [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Liability related to guaranty					0
Lawn and Garden Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Interest rate		6.00%
Notes Receivable, Fair Value Disclosure		$ 17,800,000
Notes receivable, carrying value				$ 18,700,000	19,100,000	18,700,000
Amount of consideration received		110,000,000
Proceeds from divestiture of businesses		90,000,000
Promissory note receivable		$ 20,000,000
Maturity date of promissory note receivable		2020-08
Discontinued operations pre-tax charge					1,225,000
Escrow deposit released					7,400,000
Escrow deposit		$ 8,600,000
Escrow deposit due to be settled date		2016-08
Adjustment to working capital							4,000,000
Provision for loss on note receivable			$ 23,000,000
Lawn and Garden Business [Member] | Notes Receivable [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Interest income on notes receivable					$ 1,000,000	$ 1,300,000	$ 1,300,000