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Note 7 - Inventories (Details) - Summary of Inventory (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Housing Completed or Under Construction:    
Housing Completed or Under Construction $ 732,692us-gaap_InventoryHomesUnderConstruction $ 636,700us-gaap_InventoryHomesUnderConstruction
Land and Land Under Development:    
Land and Land Under Development 935,268us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts 774,961us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts
Total Inventories 1,667,960us-gaap_InventoryNet 1,411,661us-gaap_InventoryNet
West [Member]    
Housing Completed or Under Construction:    
Housing Completed or Under Construction 343,134us-gaap_InventoryHomesUnderConstruction
/ us-gaap_PublicUtilitiesInventoryAxis
= mdc_WestMember
270,778us-gaap_InventoryHomesUnderConstruction
/ us-gaap_PublicUtilitiesInventoryAxis
= mdc_WestMember
Land and Land Under Development:    
Land and Land Under Development 507,252us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts
/ us-gaap_PublicUtilitiesInventoryAxis
= mdc_WestMember
459,512us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts
/ us-gaap_PublicUtilitiesInventoryAxis
= mdc_WestMember
Mountain [Member]    
Housing Completed or Under Construction:    
Housing Completed or Under Construction 220,489us-gaap_InventoryHomesUnderConstruction
/ us-gaap_PublicUtilitiesInventoryAxis
= mdc_MountainMember
194,101us-gaap_InventoryHomesUnderConstruction
/ us-gaap_PublicUtilitiesInventoryAxis
= mdc_MountainMember
Land and Land Under Development:    
Land and Land Under Development 277,583us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts
/ us-gaap_PublicUtilitiesInventoryAxis
= mdc_MountainMember
211,526us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts
/ us-gaap_PublicUtilitiesInventoryAxis
= mdc_MountainMember
East [Member]    
Housing Completed or Under Construction:    
Housing Completed or Under Construction 169,069us-gaap_InventoryHomesUnderConstruction
/ us-gaap_PublicUtilitiesInventoryAxis
= mdc_EastMember
171,821us-gaap_InventoryHomesUnderConstruction
/ us-gaap_PublicUtilitiesInventoryAxis
= mdc_EastMember
Land and Land Under Development:    
Land and Land Under Development $ 150,433us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts
/ us-gaap_PublicUtilitiesInventoryAxis
= mdc_EastMember
$ 103,923us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts
/ us-gaap_PublicUtilitiesInventoryAxis
= mdc_EastMember