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Components of Debt Obligations (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Notes payable to former shareholders of acquired businesses $ 11,000 $ 17,000
Other   14
Total debt 711,000 717,014
Less current portion 6,000 6,014
Long-term debt, net of current portion 705,000 711,000
Total debt 711,000 717,014
6 3/4 % Senior Notes Due 2020
   
Debt Instrument [Line Items]    
Senior notes 400,000 400,000
6.0% Senior Notes Due 2022
   
Debt Instrument [Line Items]    
Senior notes $ 300,000 $ 300,000