Acquisition - Additional Information (Detail) - USD ($)			2 Months Ended	3 Months Ended		9 Months Ended
	Aug. 17, 2017	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Fund used to acquire business from revolving credit facility			$ 0	$ 0		$ 0
Repayment of revolving credit facility						201,000,000	$ 249,700,000
Goodwill			68,461,000	68,461,000		68,461,000		$ 10,523,000
Net income (loss)				20,098,000	$ 7,787,000	76,829,000	$ 55,217,000
Acquisition-related expenses						$ 500,000
Blended statutory rate						38.00%
Trex Commercial Products, Inc. (TCP) [Member]
Business Acquisition [Line Items]
Revenue			9,200,000
Net income (loss)			(75,000)
Staging Concepts Acquisition, LLC [Member]
Business Acquisition [Line Items]
Certain assets and liabilities acquired in cash		$ 71,800,000
Estimated consideration			71,804,000	71,804,000		$ 71,804,000
Goodwill			57,938,000	57,938,000		57,938,000
Goodwill expected to be amortized and deductible for tax purposes			$ 1,100,000	$ 1,100,000		$ 1,100,000
Amortization period for intangible assets						12 months
Staging Concepts Acquisition, LLC [Member] | Revolving Credit Facility [Member]
Business Acquisition [Line Items]
Fund used to acquire business from revolving credit facility		$ 30,000,000
Repayment of revolving credit facility	$ 30,000,000