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Acquisitions (Tables)
 12 Months Ended
Dec. 31, 2013
Business Acquisition [Line Items]  
Schedule of allocated purchase price paid to fair value of acquired net assets
The following table summarizes the allocation of the purchase price paid to the fair value of the net assets for Prime and the 2012 and 2013 acquisitions, in the aggregate, (in thousands):
 
2013 Acquisitions
 
2012 Acquisitions
 
Prime
Accounts receivable
$
22,666

 
$
15,175

 
$
8,149

Other current assets
922

 
1,240

 
496

Property and equipment
14,392

 
32,387

 
3,996

Goodwill
78,646

 
75,407

 
90,654

Customer relationship intangible assets
19,727

 
5,932

 
9,400

Other noncurrent assets
12

 
623

 
100

Accounts payable and other liabilities
(35,717
)
 
(41,787
)
 
(16,033
)
Total
$
100,648

 
$
88,977

 
$
96,762
Two Thousand Twelve [Member]
  
Business Acquisition [Line Items]  
Business Acquisition, Pro Forma Information
The following supplemental unaudited pro forma financial information of the Company for the years ended December 31, 2012 and 2011 includes the results of operations for the 2012 acquisitions, in the aggregate, as if the 2012 acquisitions had been completed on January 1, 2011 (in thousands):
 
Year Ended December 31,
 
2012
 
2011
Revenues
$
1,185,927

 
$
1,037,303

Net income
$
38,850

 
$
28,688
Two Thousand Thirteen [Member]
  
Business Acquisition [Line Items]  
Business Acquisition, Pro Forma Information
The following supplemental unaudited pro forma financial information of the Company for the years ended December 31, 2013 and 2012 includes the results of operations for the 2013 acquisitions, in the aggregate, as if the acquisitions had been completed on January 1, 2012 (in thousands):
 
Year Ended December 31,
 
2013
 
2012
Revenues
$
1,466,404

 
$
1,265,698

Net income
$
49,137

 
$
37,345
Prime [Member]
  
Business Acquisition [Line Items]  
Business Acquisition, Pro Forma Information
The following supplemental unaudited pro forma financial information of the Company for the year ended December 31, 2011 includes the results of operations as if the Prime acquisition had been completed on January 1, 2011 (in thousands, except per share data):
 
Year Ended December 31, 2011
Revenues
$
894,127

Net income
$
28,871

Basic earnings per share
$
0.94

Diluted earnings per share
$
0.91