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Notes Payable - Summary of Notes Payable (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
May 22, 2012 | Jul. 31, 2011 | Dec. 31, 2013 Credit Facility [Member] | Dec. 31, 2013 3.25 % notes payable due in next year [Member]
Debt Instrument [Line Items] |  |  |  |
Average effective interest rate |  |  | 2.90% |
Annual installments |  |  |  | $ 825
Percentage of Interest accrues | 3.25% | 3.25% |  | 3.25%

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- Definition Amount of the total principal payments made during the annual reporting period. + 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 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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