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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, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Income from continuing operations	$ (774)	$ 9,589	$ 6,685	$ 19,503	$ (1,378)	$ 7,320	$ 6,446	$ 18,026	$ 35,003	$ 30,414	$ 25,379
Basic
Weighted average common shares outstanding	51,669	51,736	49,464	48,146	48,455	48,451	48,273	48,182	50,280	48,343	48,632
Diluted
Stock options									876	761	194
Restricted stock awards									277	293	263
Contingent shares									29	129	52
Convertible senior subordinated notes									1,231	1,961
Diluted weighted average common shares outstanding	51,669	54,445	52,024	51,385	48,455	51,209	52,052	52,618	52,693	51,487	49,141
Basic earnings per share from continuing operations	$ (0.02)	$ 0.19	$ 0.14	$ 0.41	$ (0.03)	$ 0.15	$ 0.13	$ 0.37	$ 0.70	$ 0.63	$ 0.52
Diluted earnings per share from continuing operations	$ (0.02)	$ 0.18	$ 0.13	$ 0.38	$ (0.03)	$ 0.14	$ 0.12	$ 0.34	$ 0.66	$ 0.59	$ 0.52

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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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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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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