Quarterly report pursuant to Section 13 or 15(d)

Line of Credit - Additional Information (Detail)

v2.4.0.8
Line of Credit - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 1 Months Ended
Jun. 30, 2013
Oct. 29, 2012
Ninth Amended and Restated [Member]
Oct. 29, 2012
Eleventh Amendment [Member]
Line of Credit Facility [Line Items]      
Revolving credit facility, maximum borrowing capacity   $ 60 $ 80
Revolving credit facility, expiration date   Dec. 31, 2013 Dec. 31, 2014
Revolving credit facility, interest rate description Amounts borrowed under our revolving line of credit bear interest, at our option, at either the prime lending rate established by JPMorgan Chase Bank, N.A. or LIBOR plus 1.5 percent    
Revolving credit facility, interest rate above LIBOR 1.50%    
Revolving credit facility, unused annual commitment fee 0.25%    
Revolving credit facility, amount outstanding 0    
Total outstanding letters of credit 48.7    
Revolving credit facility, unused portion 31.3    
Line of credit covenant, current ratio 125.00%    
Line of credit covenant, debt to net worth 50.00%    
Line of credit covenant, Earnings before interest, taxes, depreciation and amortization (EBITDA) to interest expense ratio 400.00%    
Line of credit covenant, minimum net worth required $ 244.8