Debt - Fixed Charge Metrics (Detail)	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Debt Disclosure [Line Items]
Covenant Limit	1.25	1.25	1.25	2.50
Actual FCCR	1.93	2.09	2.27	2.60