Dividend Reinvestment and Cash Purchase Plan - Additional Information (Detail)	12 Months Ended
Dec. 31, 2013
Dividend Reinvestment And Cash Purchase Plan [Abstract]
Average of closing price of the Common Shares	100.00%

Under the dividend reinvestment plan, common shares are purchased at 100% of the average closing price of the common shares as published for the five trading days immediately prior to the dividend record date or prior to the option cash payment purchase date, whichever is applicable.

No definition available.

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration