Basis of Presentation and Significant Accounting Policies - Summary of Changes in Warranty Liability (Details) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]
Warranty liability, beginning of period	$ 14,174,000	$ 18,117,000
Warranty provision during period	7,695,000	7,086,000
Warranty payments during period	(9,419,000)	(10,579,000)
Warranty charges related to construction services projects	120,000	128,000
Warranty liability, end of period	$ 12,570,000	$ 14,752,000