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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Income from continuing operations	$ 11,416	$ 8,387	$ 36,442	$ 30,185
Basic
Weighted average common shares outstanding	53,968	52,031	53,632	51,802
Diluted
Stock options	1,544	814	1,524	811
Restricted stock awards	319	229	374	283
Contingent shares		5		5
Diluted weighted average common shares outstanding	55,831	53,079	55,530	52,901
Basic earnings per share from continuing operations	$ 0.21	$ 0.16	$ 0.68	$ 0.58
Diluted earnings per share from continuing operations	$ 0.20	$ 0.16	$ 0.66	$ 0.57

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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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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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