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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