Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
Change in Rate Based on Leverage Ratio (Parenthetical) (Detail)
Mar. 31, 2013
Maximum
Less than 3.00 to 1.00
Mar. 31, 2013
Maximum
Greater than or equal to 3.00 to 1.00 but less than 4.00 to 1.00
Mar. 31, 2013
Maximum
Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00
Mar. 31, 2013
Maximum
Greater than or equal to 5.00 to 1.00 but less than 6.00 to 1.00
Mar. 31, 2013
Minimum
Greater than or equal to 3.00 to 1.00 but less than 4.00 to 1.00
Mar. 31, 2013
Minimum
Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00
Mar. 31, 2013
Minimum
Greater than or equal to 5.00 to 1.00 but less than 6.00 to 1.00
Mar. 31, 2013
Minimum
Greater than or equal to 6.00 to 1.00
Sep. 30, 2013
Less than 3.25 to 1.00
Maximum
Sep. 30, 2013
Greater than or equal to 3.25 to 1.00 but less than 4.50 to 1.00
Maximum
Sep. 30, 2013
Greater than or equal to 3.25 to 1.00 but less than 4.50 to 1.00
Minimum
Sep. 30, 2013
Greater than or equal to 4.50 to 1.00 but less than 6.00 to 1.00
Maximum
Sep. 30, 2013
Greater than or equal to 4.50 to 1.00 but less than 6.00 to 1.00
Minimum
Sep. 30, 2013
Greater than or equal to 6.00 to 1.00
Minimum
Debt Instrument [Line Items]                            
Leverage ratio 3.00% 4.00% 5.00% 6.00% 3.00% 4.00% 5.00% 6.00% 3.25% 4.50% 3.25% 6.00% 4.50% 6.00%