Summary of Significant Accounting Policies - Schedule of Accrued Warranty Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Standard Product Warranty Disclosure [Abstract]
Accrued warranty—beginning of period	$ 343,279	$ 216,459	$ 266,655	$ 180,754
Warranty costs incurred	(39,481)	(16,571)	(87,881)	(56,734)
Net changes in liability for pre-existing warranties, including expirations and foreign exchange impact	4,768	(19,523)	7,239	(12,889)
Provision for warranty	60,156	46,454	182,709	115,688
Accrued warranty—end of period	$ 368,722	$ 226,819	$ 368,722	$ 226,819