Related Party Transactions and Arrangements (Schedule of Amount Contractually Due and Forgiven in Connection With Operation Related Services) (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended	12 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Jun. 30, 2013 Incurred [Member] Operation Fees and Reimbursements [Member]	Jun. 30, 2012 Incurred [Member] Operation Fees and Reimbursements [Member]	Jun. 30, 2013 Incurred [Member] Operation Fees and Reimbursements [Member]	Jun. 30, 2012 Incurred [Member] Operation Fees and Reimbursements [Member]	Jun. 30, 2013 Forgiven [Member] Operation Fees and Reimbursements [Member]	Jun. 30, 2012 Forgiven [Member] Operation Fees and Reimbursements [Member]	Jun. 30, 2013 Forgiven [Member] Operation Fees and Reimbursements [Member]	Jun. 30, 2012 Forgiven [Member] Operation Fees and Reimbursements [Member]	Jun. 30, 2013 Payable [Member] Operation Fees and Reimbursements [Member]	Dec. 31, 2012 Payable [Member] Operation Fees and Reimbursements [Member]	Jun. 30, 2013 American Realty Capital Advisors III LLC [Member] Advisor [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Incurred [Member] Acquisition and Related Expenses [Member]	Jun. 30, 2012 Nonrecurring Fees [Member] Incurred [Member] Acquisition and Related Expenses [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Incurred [Member] Acquisition and Related Expenses [Member]	Jun. 30, 2012 Nonrecurring Fees [Member] Incurred [Member] Acquisition and Related Expenses [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Incurred [Member] Financing fees and related cost reimbursements [Member]	Jun. 30, 2012 Nonrecurring Fees [Member] Incurred [Member] Financing fees and related cost reimbursements [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Incurred [Member] Financing fees and related cost reimbursements [Member]	Jun. 30, 2012 Nonrecurring Fees [Member] Incurred [Member] Financing fees and related cost reimbursements [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Incurred [Member] Other Expense Reimbursements [Member]	Jun. 30, 2012 Nonrecurring Fees [Member] Incurred [Member] Other Expense Reimbursements [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Incurred [Member] Other Expense Reimbursements [Member]	Jun. 30, 2012 Nonrecurring Fees [Member] Incurred [Member] Other Expense Reimbursements [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Forgiven [Member] Acquisition and Related Expenses [Member]	Jun. 30, 2012 Nonrecurring Fees [Member] Forgiven [Member] Acquisition and Related Expenses [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Forgiven [Member] Acquisition and Related Expenses [Member]	Jun. 30, 2012 Nonrecurring Fees [Member] Forgiven [Member] Acquisition and Related Expenses [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Forgiven [Member] Financing fees and related cost reimbursements [Member]	Jun. 30, 2012 Nonrecurring Fees [Member] Forgiven [Member] Financing fees and related cost reimbursements [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Forgiven [Member] Financing fees and related cost reimbursements [Member]	Jun. 30, 2012 Nonrecurring Fees [Member] Forgiven [Member] Financing fees and related cost reimbursements [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Forgiven [Member] Other Expense Reimbursements [Member]	Jun. 30, 2012 Nonrecurring Fees [Member] Forgiven [Member] Other Expense Reimbursements [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Forgiven [Member] Other Expense Reimbursements [Member]	Jun. 30, 2012 Nonrecurring Fees [Member] Forgiven [Member] Other Expense Reimbursements [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Payable [Member] Acquisition and Related Expenses [Member]	Dec. 31, 2012 Nonrecurring Fees [Member] Payable [Member] Acquisition and Related Expenses [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Payable [Member] Financing fees and related cost reimbursements [Member]	Dec. 31, 2012 Nonrecurring Fees [Member] Payable [Member] Financing fees and related cost reimbursements [Member]	Jun. 30, 2013 Nonrecurring Fees [Member] Payable [Member] Other Expense Reimbursements [Member]	Dec. 31, 2012 Nonrecurring Fees [Member] Payable [Member] Other Expense Reimbursements [Member]	Jun. 30, 2013 Recurring Fees [Member] Incurred [Member] Base Management Fees [Member]	Jun. 30, 2012 Recurring Fees [Member] Incurred [Member] Base Management Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Incurred [Member] Base Management Fees [Member]	Jun. 30, 2012 Recurring Fees [Member] Incurred [Member] Base Management Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Incurred [Member] Incentive Fees [Member]	Jun. 30, 2012 Recurring Fees [Member] Incurred [Member] Incentive Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Incurred [Member] Incentive Fees [Member]	Jun. 30, 2012 Recurring Fees [Member] Incurred [Member] Incentive Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Incurred [Member] Property Management Fees [Member]	Jun. 30, 2012 Recurring Fees [Member] Incurred [Member] Property Management Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Incurred [Member] Property Management Fees [Member]	Jun. 30, 2012 Recurring Fees [Member] Incurred [Member] Property Management Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Forgiven [Member] Base Management Fees [Member]	Jun. 30, 2012 Recurring Fees [Member] Forgiven [Member] Base Management Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Forgiven [Member] Base Management Fees [Member]	Jun. 30, 2012 Recurring Fees [Member] Forgiven [Member] Base Management Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Forgiven [Member] Incentive Fees [Member]	Jun. 30, 2012 Recurring Fees [Member] Forgiven [Member] Incentive Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Forgiven [Member] Incentive Fees [Member]	Jun. 30, 2012 Recurring Fees [Member] Forgiven [Member] Incentive Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Forgiven [Member] Property Management Fees [Member]	Jun. 30, 2012 Recurring Fees [Member] Forgiven [Member] Property Management Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Forgiven [Member] Property Management Fees [Member]	Jun. 30, 2012 Recurring Fees [Member] Forgiven [Member] Property Management Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Payable [Member] Base Management Fees [Member]	Dec. 31, 2012 Recurring Fees [Member] Payable [Member] Base Management Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Payable [Member] Incentive Fees [Member]	Dec. 31, 2012 Recurring Fees [Member] Payable [Member] Incentive Fees [Member]	Jun. 30, 2013 Recurring Fees [Member] Payable [Member] Property Management Fees [Member]	Dec. 31, 2012 Recurring Fees [Member] Payable [Member] Property Management Fees [Member]
Related Party Transaction [Line Items]
Related party operation fees and reimbursements	$ 9,132,000	$ 7,249,000	$ 24,564,000	$ 12,013,000	$ 2,000,000	$ 1,114,000	$ 3,169,000	$ 1,446,000	$ 23,000	$ 382,000	$ 2,284,298	$ 510,000	$ 3,138,000	$ 3,104,000	$ 5,183,000	$ 0	$ 601,000	$ 7,500,000	$ 1,259,000	$ 6,545,000	$ 2,396,000	$ 8,317,000	$ 3,913,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 364,000	$ 0	$ 0	$ 0	$ 18,000	$ 2,000,000	$ 966,000	$ 4,654,000	$ 1,447,000	$ 77,000	$ 0	$ 190,000	$ 0	$ 0	$ 148,000	$ 799,000	$ 211,000	$ 2,000,000	$ 966,000	$ 2,370,000	$ 1,235,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 148,000	$ 799,000	$ 211,000	$ 0	$ 0	$ 23,000	$ 0	$ 0	$ 0