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Carrying Value of Senior Notes (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Total debt $ 755,383 $ 374,250
Less current portion of term credit facility 47,313 17,500
Total long-term debt 708,070 356,750
Term credit facility
   
Debt Instrument [Line Items]    
Total debt 455,383 186,250
Revolving credit facility [Member]
   
Debt Instrument [Line Items]    
Total debt   188,000
6.375% Senior Notes, due August 2020
   
Debt Instrument [Line Items]    
Total debt $ 300,000