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Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Management [Member] | Dec. 30, 2011 Management [Member] | Dec. 31, 2010 Management [Member] | Dec. 31, 2011 Management [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of management fees |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |
Period of termination |  |  |  |  |  |  |  |  |  |  |  | 180 days |  |  |
Period to be considered, for average annual base management fee |  |  |  |  |  |  |  |  |  |  |  | 24 months |  |  |
Current term of the Management Agreement expiration date |  |  |  |  |  |  |  |  |  |  |  | September 29, 2013 |  |  |
Base management fees | $ 2,040 | $ 1,518 | $ 1,292 | $ 1,289 | $ 1,297 | $ 1,241 | $ 1,101 | $ 1,088 | $ 6,139 | $ 4,728 | $ 3,339 | $ 6,139 | $ 4,728 | $ 3,339 |
Total expenses related to reimbursements |  |  |  |  |  |  |  |  |  |  |  | 987 | 802 | 1,920 |
Base management fees incurred but not yet paid | $ 2,037 |  |  |  | $ 1,298 |  |  |  | $ 2,037 | $ 1,298 |  | $ 2,037 |  |  | $ 1,298

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- Definition Carrying amount as of the balance sheet date of obligations due all related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(3),(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 3, 4 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 7 + Details
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