Related Party Transactions and Arrangements (Offering Related Costs) (Detail) (Affiliates Of Former Manager [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Offering Related Costs [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 161,796	$ 211,391	$ 18,218
Commissions And Fees [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	148,232	184,384	13,835
Offering Costs And Other Reimbursements [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 13,564	$ 27,007	$ 4,383