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Borrowing Limits Amounts Outstanding and Amounts Available Under Revolving Credit Facility (Parenthetical) (Detail) (Revolving Credit Facility, USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Oct. 04, 2013 Subsequent Event
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Debt Instrument [Line Items] |  |  |  |  |
Revolving credit facility | $ 60.0 | [1] | $ 60.0 | $ 60.0 | $ 120.0
[1] | Effective October 4, 2013, the Credit Facility borrowing limit was increased to $120 million.

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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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