Related Party Transactions and Arrangements (Schedule of Amount Contractually Due and Forgiven in Connection With Operation Related Services) (Details) (USD $)	3 Months Ended					12 Months Ended			3 Months Ended													12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended									12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2013 Incurred [Member] Operation Fees and Reimbursements [Member]	Mar. 31, 2012 Incurred [Member] Operation Fees and Reimbursements [Member]	Mar. 31, 2013 Forgiven [Member] Operation Fees and Reimbursements [Member]	Mar. 31, 2012 Forgiven [Member] Operation Fees and Reimbursements [Member]	Mar. 31, 2013 Payable [Member] Operation Fees and Reimbursements [Member]	Dec. 31, 2012 Payable [Member] Operation Fees and Reimbursements [Member]	Dec. 31, 2012 American Realty Capital Advisors III LLC [Member] Advisor [Member]	Dec. 31, 2012 American Realty Capital Advisors III LLC [Member] Advisor [Member] Gross Revenue, Stand-alone Single-tenant Net Leased Properties [Member]	Mar. 31, 2013 Nonrecurring Fees [Member] Incurred [Member] Acquisition and Related Expenses [Member]	Mar. 31, 2012 Nonrecurring Fees [Member] Incurred [Member] Acquisition and Related Expenses [Member]	Mar. 31, 2013 Nonrecurring Fees [Member] Incurred [Member] Financing fees and related cost reimbursements [Member]	Mar. 31, 2012 Nonrecurring Fees [Member] Incurred [Member] Financing fees and related cost reimbursements [Member]	Mar. 31, 2013 Nonrecurring Fees [Member] Incurred [Member] Other Expense Reimbursements [Member]	Mar. 31, 2012 Nonrecurring Fees [Member] Incurred [Member] Other Expense Reimbursements [Member]	Mar. 31, 2013 Nonrecurring Fees [Member] Forgiven [Member] Acquisition and Related Expenses [Member]	Mar. 31, 2012 Nonrecurring Fees [Member] Forgiven [Member] Acquisition and Related Expenses [Member]	Mar. 31, 2013 Nonrecurring Fees [Member] Forgiven [Member] Financing fees and related cost reimbursements [Member]	Mar. 31, 2012 Nonrecurring Fees [Member] Forgiven [Member] Financing fees and related cost reimbursements [Member]	Mar. 31, 2013 Nonrecurring Fees [Member] Forgiven [Member] Other Expense Reimbursements [Member]	Mar. 31, 2012 Nonrecurring Fees [Member] Forgiven [Member] Other Expense Reimbursements [Member]	Mar. 31, 2013 Nonrecurring Fees [Member] Payable [Member] Acquisition and Related Expenses [Member]	Dec. 31, 2012 Nonrecurring Fees [Member] Payable [Member] Acquisition and Related Expenses [Member]	Mar. 31, 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]	Mar. 31, 2013 Nonrecurring Fees [Member] Payable [Member] Other Expense Reimbursements [Member]	Dec. 31, 2012 Nonrecurring Fees [Member] Payable [Member] Other Expense Reimbursements [Member]	Mar. 31, 2013 Recurring Fees [Member] Incurred [Member] Base Management Fees [Member]	Mar. 31, 2012 Recurring Fees [Member] Incurred [Member] Base Management Fees [Member]	Mar. 31, 2013 Recurring Fees [Member] Incurred [Member] Property Management Fees [Member]	Mar. 31, 2012 Recurring Fees [Member] Incurred [Member] Property Management Fees [Member]	Mar. 31, 2013 Recurring Fees [Member] Forgiven [Member] Base Management Fees [Member]	Mar. 31, 2012 Recurring Fees [Member] Forgiven [Member] Base Management Fees [Member]	Mar. 31, 2013 Recurring Fees [Member] Forgiven [Member] Property Management Fees [Member]	Mar. 31, 2012 Recurring Fees [Member] Forgiven [Member] Property Management Fees [Member]	Mar. 31, 2013 Recurring Fees [Member] Payable [Member] Base Management Fees [Member]	Dec. 31, 2012 Recurring Fees [Member] Payable [Member] Base Management Fees [Member]	Mar. 31, 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 Transaction, Property Management Fees Earned by Related Party, Percentage of Benchmark							228429800.00%	2.00%
Related party operation fees and reimbursements	$ 15,319,000	$ 4,764,000	$ 370,000	$ 332,000	$ 0	$ 382,000			$ 4,312,000	$ 3,385,000	$ 7,500,000	$ 658,000	$ 54,000	$ 177,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 364,000	$ 0	$ 0	$ 0	$ 18,000	$ 2,654,000	$ 481,000	$ 799,000	$ 63,000	$ 370,000	$ 269,000	$ 0	$ 63,000	$ 0	$ 0	$ 0	$ 0