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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								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income									$ 69,246us-gaap_NetIncomeLoss	$ 67,158us-gaap_NetIncomeLoss	$ 59,379us-gaap_NetIncomeLoss
Weighted average common shares outstanding used in basic EPS									43,201us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	43,158us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	42,851us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs									865us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	1,141us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	821us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average common shares outstanding and common share equivalents used in diluted EPS									44,066us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,299us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	43,672us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share
Basic									$ 1.60us-gaap_EarningsPerShareBasic	$ 1.56us-gaap_EarningsPerShareBasic	$ 1.39us-gaap_EarningsPerShareBasic
Diluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.69us-gaap_EarningsPerShareDiluted	$ 0.11us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.77us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 1.57us-gaap_EarningsPerShareDiluted	$ 1.52us-gaap_EarningsPerShareDiluted	$ 1.36us-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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