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Earnings (Loss) Per Share - Schedule of Weighted-Average Number of Shares Outstanding (Detail) - shares		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic weighted average common shares outstanding		137,014,000	99,715,000	127,827,000	99,647,000
Dilution effect of stock awards at end of period	[1]	0	591,000	0	709,000
Diluted weighted average common shares outstanding		137,014,000	100,306,000	127,827,000	100,356,000
Anti-dilutive stock-based compensation awards		2,787,000	1,067,000	2,939,000	927,000
Equity Unit Purchase Agreements [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock-based compensation awards		0		0
[1] No unvested stock awards were included in computing earnings (loss) per share for the three and nine months ended September 30, 2015 because the effect was anti-dilutive.

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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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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