Tax Status of Dividends Per Share and Distribution Per Unit Paid (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Dividends Payable [Line Items]
Tax Status of Dividends, Per Share/ Unit	$ 0.24
Tax Status of Dividends, %	100.00%
Ordinary income
Dividends Payable [Line Items]
Tax Status of Dividends, Per Share/ Unit	$ 0.04
Tax Status of Dividends, %	17.00%
Return of capital
Dividends Payable [Line Items]
Tax Status of Dividends, Per Share/ Unit	$ 0.20
Tax Status of Dividends, %	83.00%