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Earnings Per Share - Schedule of Weighted-Average Number of Shares Outstanding (Detail) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	92,375	92,130
Dilution effect of stock awards at end of period	276	101
Diluted weighted average common shares outstanding	92,651	92,231
Anti-dilutive stock-based compensation awards	778	376

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- Definition

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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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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