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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Income from continuing operations	$ 9,864	$ 10,987	$ 46,306	$ 41,172
Basic
Weighted average common shares outstanding	54,142	52,648	53,804	52,086
Diluted
Stock options	1,433	868	1,499	842
Restricted stock awards	244	189	330	251
Contingent shares	8	141	8	141
Diluted weighted average common shares outstanding	55,827	53,846	55,641	53,320
Basic earnings per share from continuing operations	$ 0.18	$ 0.21	$ 0.86	$ 0.79
Diluted earnings per share from continuing operations	$ 0.18	$ 0.20	$ 0.83	$ 0.77

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Incremental common shares attributable to restricted stock awards.

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Incremental common shares attributable to stock options.

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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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