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Notes Payable - Additional Information (Detail) (USD $) |  |  |  |  | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 Installment | Dec. 31, 2012 Installment | Jul. 31, 2011 Installment | Jun. 30, 2011 Installment | Jul. 31, 2011 Notes Payable, Other Payables [Member] | Jun. 30, 2011 Notes Payable, Other Payables [Member] | Dec. 31, 2013 Notes Payable, Other Payables [Member] | Dec. 31, 2012 Notes Payable, Other Payables [Member] | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 05, 2013 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member] | Dec. 31, 2013 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility commitment |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |
Revolving credit facility maturity date |  |  |  |  |  |  |  |  |  |  | Nov. 30, 2018 | Nov. 30, 2018
Spread on Libor variable rate |  |  |  |  |  |  |  |  | 1.50% | 2.50% |  |
Spread on base variable rate |  |  |  |  |  |  |  |  | 0.10% | 1.00% |  |
Percentage of unused commitment fee |  |  |  |  |  |  |  |  | 0.10% | 0.25% |  |
Revolving credit outstanding | 41,475,000 | 18,034,000 |  |  |  |  |  |  |  |  |  | 40,000,000
Remaining revolving credit outstanding |  |  |  |  |  |  |  |  |  |  |  | 85,000,000
Aggregate amount of Notes Payable |  |  |  |  | 200,000 | 367,272 | 1,300,000 | 350,000 |  |  |  |
Aggregate principal installments |  |  |  |  | $ 100,000 | $ 183,636 | $ 650,000 | $ 175,000 |  |  |  |
Average effective interest rate |  |  |  |  | 3.25% | 3.25% | 3.25% | 3.25% |  |  |  |
Number of annual installments | 2 | 2 | 2 | 2 |  |  |  |  |  |  |  |

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- Definition Amount of the required periodic payments applied to principal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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