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Fair Value of Financial Instruments - Carrying Value and Fair Value of Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Value $ 442,325 $ 250,000
Fair Value 446,025 260,340
Fixed-Rate Bonds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Value 250,000 250,000
Fair Value 254,533 260,340
2.05% Term Loan [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Value 58,785  
Fair Value 57,952  
Variable Rate Debt [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Value 133,540  
Fair Value $ 133,540