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Acquisitions - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
May 08, 2012
Feb. 04, 2013
Beall Corporation
Mar. 31, 2013
Convertible Senior Notes
Mar. 31, 2013
Unsecured Debt
Convertible Senior Notes
Apr. 23, 2012
Unsecured Debt
Convertible Senior Notes
Business Acquisition [Line Items]              
Walker acquisition, purchase price     $ 375,000,000        
Notes issued, interest rate         3.375% 3.375% 3.375%
Notes issued, due date 2018         2018 2018
Intangible assets preliminarily, Amount       8,860,000      
Acquisition expenses 618,000 1,678,000          
Estimated amortization expense for 2013 21,700,000            
Estimated amortization expense for 2014 21,900,000            
Estimated amortization expense for 2015 21,300,000            
Estimated amortization expense for 2016 20,100,000            
Estimated amortization expense for 2017 16,900,000            
Goodwill       1,725,000      
Acquisition of equity interests of Walker, revenue from date of acquisition 95,200,000            
Acquisition of equity interests of Walker, net income from date of acquisition 11,500,000            
Acquisition of goodwill amount     146,400,000        
Business acquisition cost of acquired entity purchase price       13,860,000      
Business acquisition, purchase price allocation, capital lease obligation accrual 4,700,000            
Amortization of intangibles $ 5,370,000 $ 738,000