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Borrowing Arrangements - Summary of Unsecured Credit Facility (Detail) | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Debt Disclosure [Abstract] |  |
Weighted average rates | 2.96% | 3.22%
Range of effective rates, minimum | 2.66% | 2.69%
Range of effective rates, maximum | 3.91% | 3.91%

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- Definition When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + 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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