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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								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Income (loss) from continuing operations	$ (1,136)	$ 18,006	$ 16,614	$ 37,565	$ (953)	$ 13,595	$ 13,121	$ 35,810	$ 71,049	$ 61,573	$ 51,032
Basic
Weighted average common shares outstanding	54,547	54,268	54,090	54,287	54,775	54,794	54,594	54,071	54,299	54,561	53,862
Diluted
Stock options									1,288	1,542	1,499
Restricted stock awards									234	302	328
Contingent shares									74	82
Diluted weighted average common shares outstanding	54,547	55,816	55,495	55,915	54,775	56,740	56,437	55,924	55,895	56,487	55,689
Basic earnings per share from continuing operations	$ (0.02)	$ 0.33	$ 0.31	$ 0.69	$ (0.02)	$ 0.25	$ 0.24	$ 0.66	$ 1.31	$ 1.13	$ 0.95
Diluted earnings per share from continuing operations	$ (0.02)	$ 0.32	$ 0.30	$ 0.67	$ (0.02)	$ 0.24	$ 0.23	$ 0.64	$ 1.27	$ 1.09	$ 0.92

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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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