XML 30 R42.htm IDEA: XBRL DOCUMENT v2.4.0.8
Acquisitions - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
May 08, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Beall Corporation
Feb. 04, 2013
Beall Corporation
May 08, 2012
Walker Group Holdings LLC
Dec. 31, 2013
Walker Group Holdings LLC
Dec. 31, 2012
Walker Group Holdings LLC
Apr. 25, 2013
Convertible Senior Notes
May 08, 2012
Convertible Senior Notes
Walker Group Holdings LLC
Business Acquisition [Line Items]                      
Walker acquisition, purchase price $ 377,000,000           $ 377,000,000        
Notes issued, interest rate                   3.375% 3.375%
Notes issued, due date                   2018 2018
Intangible assets preliminarily, Amount           8,860,000          
Acquisition expenses   883,000 14,409,000 0       900,000 14,400,000    
Goodwill           1,784,000          
Acquisition of goodwill amount             148,500,000        
Business acquisition cost of acquired entity purchase price           13,931,000          
Business acquisition, purchase price allocation, capital lease obligation accrual         4,700,000            
Business acquisition cost of revenue     1,597,920,000 1,530,922,000       399,800,000 270,100,000    
Intangible Assets Purchase Price Allocation   162,800,000         162,800,000        
Walker acquisition additional payment             2,100,000        
Business acquisitions pro forma income before income taxes               $ 50,800,000 $ 34,400,000