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Net Income (Loss) Per Share - Reconciliation used in Computing Basic and Diluted Net Income (Loss) per Share (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	Dec. 31, 2009
Numerator:
Income (loss) from continuing operations									$ 4,123us-gaap_IncomeLossFromContinuingOperations	$ 40,155us-gaap_IncomeLossFromContinuingOperations	$ (7,350)us-gaap_IncomeLossFromContinuingOperations
Gain from discontinued operations, net of tax									0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	153us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	187us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Net income (loss) used in computing basic and diluted net income (loss) per share	$ 1,017us-gaap_NetIncomeLoss	$ 1,073us-gaap_NetIncomeLoss	$ 169us-gaap_NetIncomeLoss	$ 1,864us-gaap_NetIncomeLoss	$ 37,403us-gaap_NetIncomeLoss	$ 599us-gaap_NetIncomeLoss	$ 466us-gaap_NetIncomeLoss	$ 1,687us-gaap_NetIncomeLoss	$ 4,123us-gaap_NetIncomeLoss	$ 40,155us-gaap_NetIncomeLoss	$ (7,197)us-gaap_NetIncomeLoss
Denominator:
Shares used in computation of basic and diluted net income (loss) per share (weighted average common shares outstanding)	27,733us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	28,505us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	28,383us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	28,370us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	28,614us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	28,558us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	28,146us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	27,424us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	28,246us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	28,190us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	27,735us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive potential common shares:
Restricted Stock and RSUs									261us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	343us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Stock options									637us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants	805us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants	0us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Shares used in computation of diluted net income (loss) per share	28,430us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	29,351us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	29,210us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	29,382us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	29,675us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	29,653us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	29,293us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	28,294us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	29,144us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	29,338us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	27,735us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net income (loss) per share from:
Continuing operations									$ 0.15us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 1.42us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.27)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations									$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Total	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.01us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ 1.31us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.06us-gaap_EarningsPerShareBasic	$ 0.15us-gaap_EarningsPerShareBasic	$ 1.42us-gaap_EarningsPerShareBasic	$ (0.26)us-gaap_EarningsPerShareBasic
Diluted net income (loss) per share from:
Continuing operations									$ 0.14us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 1.37us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.27)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations									$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Total	$ 0.04us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted	$ 0.01us-gaap_EarningsPerShareDiluted	$ 0.06us-gaap_EarningsPerShareDiluted	$ 1.26us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.06us-gaap_EarningsPerShareDiluted	$ 0.14us-gaap_EarningsPerShareDiluted	$ 1.37us-gaap_EarningsPerShareDiluted	$ (0.26)us-gaap_EarningsPerShareDiluted

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Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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