XML 34 R16.htm IDEA: XBRL DOCUMENT v3.2.0.727
Debt - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Line of Credit Facility [Line Items]      
Revolving credit borrowing $ 75,900,000 $ 60,800,000 $ 87,300,000
Weighted average interest rate 2.09%    
Letters of credit outstanding $ 3,000,000    
Additional committed borrowing capacity $ 59,100,000    
Unused commitment fees 0.25%    
Capital lease and other obligations $ 2,400,000 $ 2,900,000 $ 1,600,000
Fixed charge coverage ratio of credit facility 1.05%    
Minimum [Member]      
Line of Credit Facility [Line Items]      
Fixed charge coverage ratio $ 12,500,000    
Maximum [Member]      
Line of Credit Facility [Line Items]      
Fixed charge coverage ratio 20,000,000    
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Asset based senior secured revolving credit $ 160,000,000    
Credit facility maturity date May 28, 2019    
Revolving credit borrowing $ 75,900,000    
Amended Amortization on Real Estate Component of Borrowing Base [Member]      
Line of Credit Facility [Line Items]      
Amortization on real estate component of borrowing base 12 years 6 months