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Subsequent Events - Additional Information (Detail) (USD $)
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0 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | ||
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Nov. 20, 2013
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Dec. 31, 2013
Revolving Credit Facility [Member]
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Feb. 20, 2014
Subsequent Event [Member]
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Jan. 07, 2014
Subsequent Event [Member]
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Feb. 28, 2014
Subsequent Event [Member]
Revolving Credit Facility [Member]
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Dec. 31, 2013
Subsequent Event [Member]
Revolving Credit Facility [Member]
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Jan. 07, 2014
Subsequent Event [Member]
Partners Capital [Member]
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| Subsequent Event [Line Items] | |||||||
| Cash dividend per common share | $ 0.24 | $ 0.29 | |||||
| Dividends Payable, Date Declared | Nov. 20, 2013 | Feb. 13, 2014 | |||||
| Dividends Payable, Date of Record | Dec. 20, 2013 | Mar. 20, 2014 | |||||
| Dividends Payable, Date to be Paid | Jan. 07, 2014 | Apr. 08, 2014 | |||||
| Dividend paid to shareholders | $ 7,000,000 | $ 2,000,000 | |||||
| Unsecured revolving credit facility | 50,000,000 | 50,000,000 | |||||
| Unsecured Credit Facility maximum borrowing capacity | $ 350,000,000 | $ 400,000,000 | $ 400,000,000 | ||||