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License Revenues of Warehouse and Non-Warehouse Product Groups (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue from External Customer [Line Items]    
Software license revenue $ 19,314us-gaap_LicensesRevenue $ 17,107us-gaap_LicensesRevenue
Warehouse Product Groups    
Revenue from External Customer [Line Items]    
Software license revenue 10,925us-gaap_LicensesRevenue
/ us-gaap_ProductOrServiceAxis
= manh_WarehouseProductGroupsMember		 10,668us-gaap_LicensesRevenue
/ us-gaap_ProductOrServiceAxis
= manh_WarehouseProductGroupsMember
Non-warehouse Product Groups    
Revenue from External Customer [Line Items]    
Software license revenue $ 8,389us-gaap_LicensesRevenue
/ us-gaap_ProductOrServiceAxis
= manh_NonWarehouseProductGroupsMember		 $ 6,439us-gaap_LicensesRevenue
/ us-gaap_ProductOrServiceAxis
= manh_NonWarehouseProductGroupsMember