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Notes Payable and Credit Agreement - Additional Information (Detail) (USD $) | 1 Months Ended |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 05, 2013 | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 Notes Payable, Other Payables | Mar. 31, 2012 Notes Payable, Other Payables | Mar. 31, 2014 Minimum | Mar. 31, 2014 Maximum | Mar. 31, 2014 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee | Dec. 05, 2013 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility commitment |  |  |  |  |  |  |  |  | $ 125,000,000
Maturity Date | 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% |  |
Payments/Long term debt, Total |  | 46,725,000 | 41,475,000 |  |  |  |  | 45,500,000 |
Remaining revolving credit outstanding |  |  |  |  |  |  |  | 79,500,000 |
Aggregate amount of Notes Payable |  |  |  | 1,300,000 | 350,000 |  |  |  |
Aggregate principal installments |  |  |  | $ 650,000 | $ 175,000 |  |  |  |
Average effective interest rate |  |  |  | 3.25% | 3.25% |  |  |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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