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Acquisitions - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
May 08, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Feb. 04, 2013
Beall Corporation
Sep. 30, 2013
Walker Group Holdings LLC
Sep. 30, 2012
Walker Group Holdings LLC
Sep. 30, 2013
Walker Group Holdings LLC
Sep. 30, 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                      
Notes issued, interest rate                     3.375% 3.375%
Notes issued, due date                     2018 2018
Intangible assets preliminarily, Amount           8,860,000            
Acquisition expenses   26,000 172,000 883,000 14,074,000              
Estimated amortization expense for 2013   21,700,000   21,700,000                
Estimated amortization expense for 2014   21,900,000   21,900,000                
Estimated amortization expense for 2015   21,300,000   21,300,000                
Estimated amortization expense for 2016   20,100,000   20,100,000                
Estimated amortization expense for 2017   16,900,000   16,900,000                
Goodwill           1,796,000            
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   4,700,000                
Amortization of intangibles   5,454,000 2,984,000 16,278,000 7,175,000              
Business acquisition cost of revenue         1,182,073,000   102,300,000 96,500,000 300,600,000 140,800,000    
Intangible Assets Purchase Price Allocation 162,800,000                      
Walker acquisition additional payment 2,100,000                      
Business acquisitions pro forma income before income taxes             $ 12,900,000 $ 13,200,000 $ 38,200,000 $ 16,800,000