Summary of Significant Accounting Policies - Schedule of Accrued Warranty Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Standard Product Warranty Disclosure [Abstract]
Accrued warranty—beginning of period	$ 164,595	$ 84,371	$ 129,043	$ 53,183
Warranty costs incurred	(21,593)	(11,179)	(50,666)	(29,750)
Net changes in liability for pre-existing warranties, including expirations	1,306	14,609	12,635	24,270
Provision for warranty	26,026	25,934	79,322	66,032
Accrued warranty—end of period	$ 170,334	$ 113,735	$ 170,334	$ 113,735