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Earnings Per Share - Details of Basic and Diluted Earnings Per Share (EPS) (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	$ 13,925us-gaap_NetIncomeLoss	$ 14,648us-gaap_NetIncomeLoss
Weighted average common shares outstanding used in basic EPS	43,252us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	43,366us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs	697us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	994us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average common shares outstanding and common share equivalents used in diluted EPS	43,949us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,360us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share
Basic	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.34us-gaap_EarningsPerShareBasic
Diluted	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted

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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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