Inventories - Schedule of Inventory (Detail) (Homebuilding [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventories [Line Items]
Total Inventories	$ 1,056,099	$ 1,002,521
West [Member]
Inventories [Line Items]
Housing completed or under construction	202,247	200,858
Land and land under development	283,845	230,344
Mountain [Member]
Inventories [Line Items]
Housing completed or under construction	176,350	183,522
Land and land under development	133,360	137,221
East [Member]
Inventories [Line Items]
Housing completed or under construction	143,064	128,569
Land and land under development	117,233	122,007
Subtotal [Member]
Inventories [Line Items]
Housing completed or under construction	521,661	512,949
Land and land under development	$ 534,438	$ 489,572