Earnings Per Share (Schedule of Earnings Per Share) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 37,632us-gaap_NetIncomeLoss	$ 21,724us-gaap_NetIncomeLoss
Less: dividends and undistributed earnings allocated to unvested restricted stock units (“RSUs”)	50	52
Net income allocated to common stockholders	$ 37,582	$ 21,672
Basic weighted-average shares	107,744	106,166
Effect of dilutive employee stock options and RSUs	1,700	2,110
Diluted weighted-average shares	109,444	108,276
Basic	$ 0.35us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic
Diluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted

Net income after adjustments for dividends and undistributed earnings allocated to participating securities.

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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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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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Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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