Commitments and Contingencies (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Changes in the entity's loan loss and related legal reserves
Balance at the beginning of the period	$ 10,141,000	$ 8,934,000	$ 17,875,000
Provision for losses	1,156,000	1,368,000	8,461,000
Settlements made	(813,000)	(161,000)	(17,402,000)
Balance at the end of the period	10,484,000	10,141,000	8,934,000
Product warranty
Number of years of product warranty for workmanship and materials	1 year
Number of years of product warranty for mechanical systems	2 years
Number of years of product warranty for structural systems	10 years
Product liability reserves
Balance at the beginning of the period	20,648,000	20,112,000	24,268,000
Warranties issued	3,899,000	3,549,000	4,565,000
Changes in liability for accruals related to pre-existing warranties	1,866,000	2,823,000	5,645,000
Settlements made	(8,225,000)	(5,836,000)	(14,366,000)
Balance at the end of the period	18,188,000	20,648,000	20,112,000
Insurance reserves | RHIC
Changes in entity's subcontractor insurance reserves
Balance at the beginning of period	18,209,000	21,141,000	25,069,000
Insurance expense provisions or adjustments	(1,369,000)	(900,000)	(2,553,000)
Loss expenses paid	(2,027,000)	(2,032,000)	(1,375,000)
Balance at the end of period	14,813,000	18,209,000	21,141,000
Legal reserves
Changes in entity's legal reserves
Legal reserves	17,900,000	16,500,000
Reasonably possible losses in excess of amounts accrued	$ 13,000,000