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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
	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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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.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The number of businesses acquired by the entity during the period.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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