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Components of Long-Term Debt Obligations (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Notes payable to former shareholders of acquired businesses   $ 11,000  
Total debt $ 500,000 711,000  
Less deferred debt issue costs (5,228) (11,596)  
Less current portion   (11,000)  
Long-term debt, net 494,772 688,404  
Senior Bank Credit Facility      
Debt Instrument [Line Items]      
Credit facility 200,000    
Less deferred debt issue costs (5,500) (2,800) $ (3,700)
6 3/4 % Senior Notes Due 2020      
Debt Instrument [Line Items]      
Senior notes   400,000  
6.0% Senior Notes Due 2022      
Debt Instrument [Line Items]      
Senior notes $ 300,000 $ 300,000