Quarterly report pursuant to Section 13 or 15(d)

Schedule of Cash Distributions Declared and Paid (Detail)

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Schedule of Cash Distributions Declared and Paid (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
May 30, 2013
Sep. 12, 2013
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2013
Dividends Payable [Line Items]          
Announcement Date Jun. 28, 2013 Oct. 04, 2013 Oct. 04, 2013 Apr. 01, 2013  
Payment Date May 30, 2013 Sep. 12, 2013     Mar. 18, 2013
Dividend Payment 1st
         
Dividends Payable [Line Items]          
Announcement Date         Sep. 12, 2013
Payment Date         Oct. 04, 2013
Amount Per Share     $ 0.0525   $ 0.0525
Cash Distributed         $ 1,308
Dividend Payment 2nd
         
Dividends Payable [Line Items]          
Announcement Date         May 30, 2013
Payment Date         Jun. 28, 2013
Amount Per Share     $ 0.0500   $ 0.0500
Cash Distributed         1,240
Dividend Payment 3rd
         
Dividends Payable [Line Items]          
Announcement Date         Mar. 18, 2013
Payment Date         Apr. 01, 2013
Amount Per Share     $ 0.0500   $ 0.0500
Cash Distributed         1,234
Dividend Payment 4th
         
Dividends Payable [Line Items]          
Announcement Date         Nov. 29, 2012
Payment Date         Dec. 28, 2012
Amount Per Share     $ 0.0350   $ 0.0350
Cash Distributed         854
Dividend Payment Five
         
Dividends Payable [Line Items]          
Announcement Date         Aug. 30, 2012
Payment Date         Sep. 28, 2012
Amount Per Share     $ 0.0350   $ 0.0350
Cash Distributed         854
Dividend Payment Six
         
Dividends Payable [Line Items]          
Announcement Date         May 31, 2012
Payment Date         Jun. 21, 2012
Amount Per Share     $ 0.0350   $ 0.0350
Cash Distributed         854
Dividend Payment Seven
         
Dividends Payable [Line Items]          
Announcement Date         Mar. 07, 2012
Payment Date         Mar. 30, 2012
Amount Per Share     $ 0.0350   $ 0.0350
Cash Distributed         $ 850