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Business Combinations - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Business | Sep. 30, 2013 Business | Sep. 30, 2013 2013 Acquisitions [Member] | Sep. 30, 2014 2014 Acquisitions [Member] | Sep. 30, 2014 2014 Acquisitions [Member] | Mar. 16, 2013 Ace [Member] | Mar. 24, 2014 U.S. Insulation [Member] | Aug. 11, 2014 Marv's Insulation [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of business combination |  |  | 2 | 1 |  |  |  |  |  |
Purchase price paid in cash |  |  | $ 3,313 | $ 687 | $ 687 |  | $ 3,366 |  |  |
Note payable issued in connection with acquisition of business |  |  | 454 | 300 | 300 |  | 454 |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Revenue | 140,456 | 115,950 | 372,750 | 312,599 |  | 3,990 | 6,936 |  |  |
Net income | 6,196 | 2,967 | 8,876 | 3,663 |  | 462 | 604 |  |  |
Amortization expense of intangible assets | $ 8 | $ 40 | $ 66 | $ 144 |  |  |  |  |  |

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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 Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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