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Summary of Change in Fair Value of Level Three Assets (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Indemnification assets: |  |  |  |  |  |
Unrealized gain (loss) recognized in other expenses | $ (3,000) | $ (41,000) | $ (19,000) | $ 200,000 | $ (1,000,000) | $ 300,000
Long-term portion of certain indemnification asset |  |  |  |  |  |
Indemnification assets: |  |  |  |  |  |
Beginning balance | 5,558,000 | 6,580,000 | 6,099,000 | 7,464,000 | 7,464,000 | 14,836,000
Payments received | (1,021,000) | (419,000) | (1,578,000) | (1,128,000) | (2,331,000) | (7,080,000)
Unrealized gain (loss) recognized in other expenses | 3,000 | (41,000) | 19,000 | (216,000) | 966,000 | (292,000)
Ending balance | 4,540,000 | 6,120,000 | 4,540,000 | 6,120,000 | 6,099,000 | 7,464,000
Derivative Financial Instruments, Assets |  |  |  |  |  |
Indemnification assets: |  |  |  |  |  |
Beginning balance |  |  |  |  |  | 4,960,000
Net settlement of derivative |  |  |  |  |  | (3,561,000)
Realized loss on derivative |  |  |  |  |  | (1,399,000)
Ending balance |  |  |  |  |  |

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Realized Gain (Loss) Included in Earnings + References No definition available. + Details
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- Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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