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Components of Long-Term Debt and Capital Lease Obligations (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Long-Term Debt And Capital Lease Obligations [Line Items]    
Notes payable to former shareholders of acquired businesses $ 17,000 $ 23,000
Total debt 717,000 723,000
Less current portion 6,000 6,000
Long-term debt, net of current portion 711,000 717,000
Total capital lease obligations 14 45
Less current portion 14 21
Capital lease obligations, net of current portion   24
Long-term debt and capital lease obligations, net of current portion 711,000 717,024
6 3/4 % Senior Notes Due 2020
   
Long-Term Debt And Capital Lease Obligations [Line Items]    
Senior notes 400,000 400,000
6.0% Senior Notes Due 2022
   
Long-Term Debt And Capital Lease Obligations [Line Items]    
Senior notes $ 300,000 $ 300,000