Debt (Fixed Charge Metrics) (Detail)	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Debt Disclosure [Abstract]
Covenant Limit	1.25	1.25	1.25	1.25	2.50
Actual FCCR	2.18	1.93	2.09	2.27	2.60