Net Change in Amounts Capitalized or Accrued (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Inventory	$ 393,156,000	$ 114,111,000	$ 158,482,000
Accrued expenses (accrued warranty expenses)	158,467,000	4,162,000	(80,642,000)
Other assets	61,830,000	54,469,000	(3,600,000)
Stock Based Compensation Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Inventory	111,000	(850,000)
Accrued expenses (accrued warranty expenses)	(1,702,000)	553,000
Other assets	$ 4,552,000	$ 11,000