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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Income (loss) from continuing operations	$ (953)	$ 13,595	$ 13,121	$ 35,810	$ 4,726	$ 9,864	$ 11,416	$ 25,026	$ 61,573	$ 51,032	$ 40,607
Basic
Weighted average common shares outstanding	54,775	54,794	54,594	54,071	54,034	54,142	53,968	53,293	54,561	53,862	52,321
Diluted
Stock options									1,542	1,499	870
Restricted stock awards									302	328	261
Contingent shares									82		61
Diluted weighted average common shares outstanding	56,580	56,740	56,437	55,924	55,822	55,827	55,831	55,214	56,487	55,689	53,513
Basic earnings per share from continuing operations	$ (0.02)	$ 0.25	$ 0.24	$ 0.66	$ 0.09	$ 0.18	$ 0.21	$ 0.47	$ 1.13	$ 0.95	$ 0.78
Diluted earnings per share from continuing operations	$ (0.02)	$ 0.24	$ 0.23	$ 0.64	$ 0.08	$ 0.18	$ 0.20	$ 0.45	$ 1.09	$ 0.92	$ 0.76

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

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