Calculation of Basic and Diluted Net Income per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
BASIC EPS:
Net income	$ 162,664us-gaap_ProfitLoss	$ 188,009us-gaap_ProfitLoss	$ 299,477us-gaap_ProfitLoss
Adjust for income attributed to holders of non-vested restricted stock	(1,663)	(1,859)	(2,532)
Income attributed to common stockholders	161,001	186,150	296,945
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	144,066	144,356	151,144
Basic net income per common share	$ 1.12us-gaap_EarningsPerShareBasic	$ 1.29us-gaap_EarningsPerShareBasic	$ 1.96us-gaap_EarningsPerShareBasic
DILUTED EPS:
Income attributed to common stockholders	$ 161,001	$ 186,150	$ 296,945
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	144,066	144,356	151,144
Add dilutive effect of potential common shares	1,310	947	555
Weighted average number of diluted common shares outstanding	145,376	145,303	151,699
Diluted income per common share	$ 1.11us-gaap_EarningsPerShareDiluted	$ 1.28us-gaap_EarningsPerShareDiluted	$ 1.96us-gaap_EarningsPerShareDiluted
Potentially dilutive securities excluded as anti-dilutive	1,088	2,447	5,416

Income loss from continuing operations allocable to non vested restricted shares.

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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 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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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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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