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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 12, 2012
Sprint sellers
Sep. 28, 2012
Saxon Group
Nov. 17, 2012
Q3C Contracting, Inc
Aug. 31, 2013
Q3C Contracting, Inc
Mar. 11, 2013
FSSI acquisition
Jun. 30, 2013
FSSI acquisition
Dec. 31, 2013
Contingent Consideration Liability
item
Dec. 31, 2012
Contingent Consideration Liability
Dec. 31, 2013
Contingent Consideration Liability
Sprint sellers
Dec. 31, 2012
Contingent Consideration Liability
Sprint sellers
Dec. 31, 2012
Contingent Consideration Liability
Saxon Group
Dec. 31, 2012
Contingent Consideration Liability
Q3C Contracting, Inc
Dec. 31, 2013
Contingent Consideration Liability
FSSI acquisition
Dec. 31, 2013
Contingent Consideration Liability
Rockford sellers
Dec. 31, 2012
Contingent Consideration Liability
Rockford sellers
Rollforward of contingent consideration liability level three fair value measurements                                    
Balance at the beginning of the period                   $ 23,431 $ 12,718              
Additions to contingent consideration liability                         6,200 1,950 7,448 702    
Change in fair value of contingent consideration liability (14,900) (1,435) 2,927             2,500 2,015              
Payments       (21,197) (550) (48,116) (598) (1,025) (650)     (4,000)         (6,900) (6,900)
Reduction due to non-attainment of performance targets                   (6,500)                
Balance at the end of the period                   $ 9,233 $ 23,431              
Additional information                                    
Number of unobservable inputs                   2                
Minimum probability of acquired entity meeting contractual operating performance target (as a percent)                   33.00%                
Maximum probability of acquired entity meeting contractual operating performance target (as a percent)                   100.00%