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Earnings Per Share - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Senior Convertible Notes due 2040 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average trading price exceeds conversion price percentage	125.00%
Senior convertible notes convertible to common shares price	14.85	15.33
Restricted Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from basic average shares outstanding	1.2	1.8	2.4
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from basic average shares outstanding	3.0	2.7	2.6

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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