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Notes Payable and Other Noncurrent Liabilities - Notes Payable (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Line of Credit Facility [Line Items]    
Notes payable $ 99,701 $ 21,640
Less: Current portion 6,601 1,739
Notes Payable, Non-current 93,100 19,901
Notes Payable through December 2019 [Member]
   
Line of Credit Facility [Line Items]    
Notes payable 99,098 20,929
Gift Annuities extending through 2019 [Member]
   
Line of Credit Facility [Line Items]    
Notes payable 602 670
Notes Payable through March 2013 [Member]
   
Line of Credit Facility [Line Items]    
Notes payable $ 1 $ 41