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Acquisitions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 20, 2014
RFK [Member]
Jun. 30, 2014
RFK [Member]
Jun. 30, 2014
RFK [Member]
Customer Contracts and Trade Names [Member]
Jan. 30, 2014
VS [Member]
Jun. 30, 2014
VS [Member]
Mar. 31, 2014
VS [Member]
Business Acquisition [Line Items]                      
Date of acquisition             Jun. 20, 2014     Jan. 30, 2014  
Percentage of shares acquired           79.20%          
Payments to acquire businesses           $ 9,756          
Fees incurred from third parties as part of acquisition           102     716    
Business combinations revenue during period from acquired business             210     5,919  
Business combinations net income during period from acquired business 5,200 4,770 10,438 7,641     22     (950)  
Expected sales of acquired entity             12,000        
Non-controlling interest     (2,559)       2,559        
Percentage of shares owned by non controlling owners             20.80%        
Intangible assets subject to amortization           1,740   1,740   75 75
Weighted average life of intangible assets subject to amortization             10 years        
Goodwill arising from acquisition 9,384   9,384   8,624 732 732       244
Operating assets acquired in cash     16,217           5,580    
Liabilities assumed                 1,840    
Integration costs incurred as part of acquisition                 $ 341