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Net Income Per Share - Reconciliation of Basic and Diluted Net Income Per Share (Detail) (USD $) In Thousands, except 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
Numerator:
Net income	$ 34,192us-gaap_NetIncomeLoss	$ 29,117us-gaap_NetIncomeLoss	$ 21,224us-gaap_NetIncomeLoss	$ 31,245us-gaap_NetIncomeLoss	$ 20,237us-gaap_NetIncomeLoss	$ 2,458us-gaap_NetIncomeLoss	$ 7,320us-gaap_NetIncomeLoss	$ 5,761us-gaap_NetIncomeLoss	$ 115,778us-gaap_NetIncomeLoss	$ 35,776us-gaap_NetIncomeLoss	$ 48,029us-gaap_NetIncomeLoss
Denominator:
Shares used in net income per common share - basic									53,232,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	53,061,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	52,686,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:
Stock options, restricted stock and employee stock purchase plan									283,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	420,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	548,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Shares used in net income per common share - diluted									53,515,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	53,481,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	53,234,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per common share:
Basic	$ 0.64us-gaap_EarningsPerShareBasic	$ 0.55us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.58us-gaap_EarningsPerShareBasic	$ 0.38us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ 0.14us-gaap_EarningsPerShareBasic	$ 0.11us-gaap_EarningsPerShareBasic	$ 2.17us-gaap_EarningsPerShareBasic	$ 0.67us-gaap_EarningsPerShareBasic	$ 0.91us-gaap_EarningsPerShareBasic
Diluted	$ 0.64us-gaap_EarningsPerShareDiluted	$ 0.55us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.58us-gaap_EarningsPerShareDiluted	$ 0.38us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ 0.14us-gaap_EarningsPerShareDiluted	$ 0.11us-gaap_EarningsPerShareDiluted	$ 2.16us-gaap_EarningsPerShareDiluted	$ 0.67us-gaap_EarningsPerShareDiluted	$ 0.90us-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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