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Commitments and Contingencies - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013
Loss Contingencies [Line Items] |  |
Settlements on legal matters | $ 37,000 | $ 793,000
September Fifteenth Two Thousand Eight [Member] |  |
Loss Contingencies [Line Items] |  |
"Lawsuit" filed date |  | September 15, 2008
September Eighteenth Two Thousand Eight [Member] |  |
Loss Contingencies [Line Items] |  |
"Lawsuit" filed date |  | September 18, 2008
September Twenty Fourth Two Thousand Ten [Member] |  |
Loss Contingencies [Line Items] |  |
"Lawsuit" filed date |  | September 24, 2010

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- Definition States the date the complaint was formally filed in a court of law, in arbitration or mediation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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