Summary of the Computations of Basic and Diluted Earnings per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net income (loss)	$ 295us-gaap_NetIncomeLoss	$ (477)us-gaap_NetIncomeLoss
Denominator:
Total basic weighted-average common shares outstanding	60,342	59,079
Effect of dilutive stock options and restricted stock based on treasury stock method	1,684
Weighted average diluted shares	62,026	59,079
Basic earnings per common share:
Net income (loss) per share-basic	$ 0.00us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic
Diluted earnings per common share:
Net income (loss) per share-diluted	$ 0.00us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted

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 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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