Summary of Significant Accounting Policies - Schedule of Accrued Warranty Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Standard Product Warranty Disclosure [Abstract]
Accrued warranty—beginning of period	$ 465,866	$ 306,951	$ 401,790	$ 266,655
Warranty costs incurred	(49,604)	(25,384)	(94,285)	(48,400)
Net changes in liability for pre-existing warranties, including expirations and foreign exchange impact	(10,917)	8,915	(10,416)	2,653
Additional warranty accrued from adoption of the new revenue standard			37,139
Provision for warranty	118,664	52,797	189,781	122,371
Accrued warranty—end of period	$ 524,009	$ 343,279	$ 524,009	$ 343,279