Net Income (Loss) per Share - Earnings Attributable to Common Shareholders and Weighted Average Common Shares Outstanding (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Continuing operations
Net income (loss) from continuing operations	$ 10,286	$ (3,760)	$ 14,866	$ 21,067
Less: Net income attributable to noncontrolling interests	(865)	(48)	(911)	(88)
Earnings (loss) available for diluted earnings per share	9,421	(3,808)	13,955	20,979
Discontinued operations
Income from discontinued operations, net of taxes	$ 0	$ 1,229	$ 0	$ 1,647
Denominator:
Weighted average common shares outstanding — basic	41,939	42,259	41,939	42,171
Dilutive effect of stock options, restricted stock and equity-settled awards	27	0	27	283
Total weighted average shares outstanding — diluted	41,966	42,259	41,966	42,454
Anti-dilutive awards excluded from diluted weighted average shares (in shares)	0	1,774	0	1,663