Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal net operating loss carryforwards	$ 110,779		$ 129,695
State net operating loss carryforwards	47,646		49,551
Alternative minimum tax and other tax credit carryforwards	12,069		10,988
Stock-based compensation expense	29,267		29,196
Warranty, litigation and other reserves	15,525		14,556
Deferred compensation retirement plans	12,111		11,252
Asset impairment charges	8,984		14,080
Inventory, additional costs capitalized for tax purposes	4,450		3,930
Other, net	1,703		2,063
Total deferred tax assets	242,534		265,311
Valuation allowance	(39,697)	(238,800)	(248,306)
Total deferred tax assets, net of valuation allowance	202,837		17,005
Property, equipment and other assets	6,164		5,753
Discount on notes receivable	4,204		4,204
Deferred revenue	3,426		3,796
Unrealized gain on marketable securities	3,422		1,863
Other, net	1,400		1,389
Total deferred tax liabilities	18,616		17,005
Net deferred tax asset	$ 184,221