Summary of Significant Accounting Policies - Additional Information 1 (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Goodwill additions	$ 8,500,000	$ 34,300,000
Goodwill impairment	0	0	$ 0
Excess insurance liability	$ 50,000,000
Insurance coverage period	10 years
Warranty period for U.S. Operations	1 year
Discount on sales	$ 250,500,000	179,300,000	150,900,000
Advertising costs	$ 30,900,000	$ 30,100,000	$ 26,100,000
Certain markets [Member]
Significant Accounting Policies [Line Items]
Warranty period for U.S. Operations	10 years