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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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator:
Income from continuing operations	$ 8,387	$ 6,685	$ 30,185	$ 26,188
Basic
Weighted average common shares outstanding	52,031	49,464	51,802	48,809
Diluted
Stock options	814	868	811	829
Restricted stock awards	229	224	283	290
Contingent shares	5	118	5	118
Convertible senior subordinated notes		1,350		1,181
Diluted weighted average common shares outstanding	53,079	52,024	52,901	51,227
Basic earnings per share from continuing operations	$ 0.16	$ 0.14	$ 0.58	$ 0.54
Diluted earnings per share from continuing operations	$ 0.16	$ 0.13	$ 0.57	$ 0.51

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Incremental common shares attributable to restricted stock awards.

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted 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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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.

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