Acquisition - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended
	Aug. 17, 2017	Jul. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Fund used to acquire business from revolving credit facility			$ 84,500
Repayment of revolving credit facility			8,000	$ 16,000
Net income (loss)			37,110	$ 27,949
Trex Commercial Products, Inc. (TCP) [Member]
Business Acquisition [Line Items]
Revenue			16,000
Net income (loss)			(500)
Staging Concepts Acquisition, LLC [Member]
Business Acquisition [Line Items]
Certain assets and liabilities acquired		$ 71,800
Total consideration			71,804
Goodwill			57,938
Goodwill expected to be amortized and deductible for tax purposes			$ 3,900
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
Repayment of revolving credit facility	$ 30,000