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Earnings (Loss) per Common Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings (loss) per common share—basic
Net income	$ 3,060	$ (5,866)	$ 60,192	$ 66,629
Weighted-average common shares outstanding—basic (in shares)	94,450	94,081	94,246	94,021
Basic earnings per common share (usd per share)	$ 0.03	$ (0.06)	$ 0.64	$ 0.71
Earnings (loss) per common share—diluted
Weighted-average common shares outstanding—basic (in shares)	94,450	94,081	94,246	94,021
Options and restricted stock (in shares)	2,429	0	2,097	1,666
Weighted-average common shares outstanding—diluted (in shares)	96,879	94,081	96,343	95,687
Dilutive earnings (loss) per common share (usd per share)	$ 0.03	$ (0.06)	$ 0.62	$ 0.70

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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