Summary of Significant Accounting Policies - Schedule of Accrued Warranty Activity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]
Accrued warranty-beginning of period	$ 84,371	$ 36,877	$ 53,183	$ 13,012
Warranty costs incurred	(11,179)	(6,392)	(29,750)	(11,100)
Changes in liability for pre-existing warranties, including expirations	14,609	4,878	24,270	8,052
Provision for warranty	25,934	18,359	66,032	43,758
Accrued warranty-end of period	$ 113,735	$ 53,722	$ 113,735	$ 53,722