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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share for Continuing Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator:
Income from continuing operations	$ 9,589	$ 7,320	$ 35,777	$ 31,792
Basic
Weighted average common shares outstanding	51,736	48,451	49,812	48,303
Diluted
Stock options	905	725	860	779
Restricted stock awards	204	210	260	290
Contingent shares	34	102	34	102
Convertible senior subordinated notes	1,566	1,721	1,319	1,995
Diluted weighted average common shares outstanding	54,445	51,209	52,285	51,469
Basic earnings per share from continuing operations	$ 0.19	$ 0.15	$ 0.72	$ 0.66
Diluted earnings per share from continuing operations	$ 0.18	$ 0.14	$ 0.68	$ 0.62

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) derived from continuing operations during 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 contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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