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Goodwill and Intangible Assets - Additional Information (Detail) (USD $) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Oct. 31, 2010 Non-compete Agreement | Sep. 30, 2013 Non-compete Agreement | Sep. 30, 2012 Non-compete Agreement | Sep. 30, 2013 Non-compete Agreement | Sep. 30, 2012 Non-compete Agreement | Sep. 30, 2013 Customer Relationships | Sep. 30, 2012 Customer Relationships | Sep. 30, 2013 Customer Relationships | Sep. 30, 2012 Customer Relationships
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accumulated impairment losses | $ 0 | $ 0 |  |  |  |  |  |  |  |  |
Contract term |  |  | 3 years |  |  |  |  |  |  |  |
Amortization period (in years) |  |  |  |  |  | 3 years |  |  |  | 7 years |
Amortization expense |  |  |  | $ 117,000 | $ 117,000 | $ 350,000 | $ 350,000 | $ 911,000 | $ 911,000 | $ 2,700,000 | $ 2,700,000

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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