Quarterly report pursuant to Section 13 or 15(d)

Change in Rate Based on Leverage Ratio (Parenthetical) (Detail)

v2.4.0.6
Change in Rate Based on Leverage Ratio (Parenthetical) (Detail)
Sep. 30, 2012
Maximum | Less than 3.25 to 1.00
 
Debt Instrument [Line Items]  
Leverage ratio 3.25
Maximum | Greater than or equal to 3.25 to 1.00 but less than 4.50 to 1.00
 
Debt Instrument [Line Items]  
Leverage ratio 4.50
Maximum | Greater than or equal to 4.50 to 1.00 but less than 6.00 to 1.00
 
Debt Instrument [Line Items]  
Leverage ratio 6
Minimum | Greater than or equal to 3.25 to 1.00 but less than 4.50 to 1.00
 
Debt Instrument [Line Items]  
Leverage ratio 3.25
Minimum | Greater than or equal to 4.50 to 1.00 but less than 6.00 to 1.00
 
Debt Instrument [Line Items]  
Leverage ratio 4.5
Minimum | Greater than or equal to 6.00 to 1.00
 
Debt Instrument [Line Items]  
Leverage ratio 6