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Notes Payable - Summary of Notes Payable (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
May 22, 2012
Jul. 31, 2011
Dec. 31, 2013
Credit Facility [Member]
Dec. 31, 2013
3.25 % notes payable due in next year [Member]
Debt Instrument [Line Items]        
Average effective interest rate     2.90%  
Annual installments       $ 825
Percentage of Interest accrues 3.25% 3.25%   3.25%