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Notes Payable and Other Noncurrent Liabilities - Notes Payable (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Notes Payable through December 2019 [Member]
  
Line of Credit Facility [Line Items]  
Monthly payment of notes payable $ 556
Interest rate of notes payable 1.75%
Number of days of bank operating rate to calculate interest on notes payable 30 days
Interest rate of notes payable, Minimum 1.96%
Gift Annuities extending through 2019 [Member]
  
Line of Credit Facility [Line Items]  
Quarterly payment of notes payable $ 34
Interest rate of notes payable, Minimum 10.00%
Notes Payable through March 2013 [Member]
  
Line of Credit Facility [Line Items]  
Interest rate of notes payable, Minimum 8.80%
Interest rate of notes payable, Maximum 11.00%