Summary of Significant Accounting Policies - Schedule of Accrued Warranty Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Standard Product Warranty Disclosure [Abstract]
Accrued warranty—beginning of period	$ 747,826	$ 401,790
Warranty costs incurred	(54,189)	(44,681)
Net changes in liability for pre-existing warranties, including expirations and foreign exchange impact	37,750	501
Additional warranty accrued from adoption of the new revenue standard		37,139
Provision for warranty	112,521	71,117
Accrued warranty—end of period	$ 843,908	$ 465,866