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Stock-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation expense $ 9,518us-gaap_AllocatedShareBasedCompensationExpense $ 10,070us-gaap_AllocatedShareBasedCompensationExpense
Cost of revenue [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation expense 2,504us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 1,338us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Cost of revenue [Member] | Software delivery, Support and Maintenance [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation expense 1,096us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_ProductOrServiceAxis
= mdrx_SoftwareDeliverySupportAndMaintenanceMember		 380us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_ProductOrServiceAxis
= mdrx_SoftwareDeliverySupportAndMaintenanceMember
Cost of revenue [Member] | Client services [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation expense 1,408us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_ProductOrServiceAxis
= mdrx_ClientServicesMember		 958us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_ProductOrServiceAxis
= mdrx_ClientServicesMember
Selling, General and Administrative Expenses [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation expense 5,011us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 6,178us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
Research and development [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation expense $ 2,003us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 $ 2,554us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember