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Intangible Assets (Detail) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2011 Noncompete Agreements | Jun. 30, 2011 Noncompete Agreements | Jun. 30, 2011 Noncompete Agreements Amortizable Intangible Assets | Dec. 31, 2010 Noncompete Agreements Amortizable Intangible Assets | Jun. 30, 2011 Noncompete Agreements Amortization of Intangible Assets | Jun. 30, 2011 Customer Relationships | Jun. 30, 2011 Customer Relationships | Jun. 30, 2011 Customer Relationships Amortizable Intangible Assets | Dec. 31, 2010 Customer Relationships Amortizable Intangible Assets | Jun. 30, 2011 Customer Relationships Amortization of Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | $ 25,874,000 |  | $ 1,284,000 | $ 1,400,000 | $ 1,400,000 | $ (116,000) |  | $ 24,590,000 | $ 25,500,000 | $ 25,500,000 | $ (910,000)
Amortization | (2,055,000) | (117,000) | (233,000) |  |  | (233,000) | (910,000) | (1,822,000) |  |  | (1,822,000)
Ending Balance | $ 23,819,000 | $ 1,051,000 | $ 1,051,000 | $ 1,400,000 | $ 1,400,000 | $ (349,000) | $ 22,768,000 | $ 22,768,000 | $ 25,500,000 | $ 25,500,000 | $ (2,732,000)

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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 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=6943989&loc=d3e3602-108585 Reference 4: 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 + Details
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- Definition The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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