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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Continuing operations
Net income (loss) from continuing operations	$ (3,760)	$ 12,302	$ 21,067	$ 16,222
Less: Net (income) attributable to noncontrolling interests	(48)	(640)	(88)	(720)
Earnings (loss) available for diluted earnings per share	(3,808)	11,662	20,979	15,502
Less: Undistributed net income from continuing operations allocated to participating securities	0	(2,173)	0	(2,889)
Earnings (loss) from continuing operations available to common shareholders for basic earnings per share	(3,808)	9,489	20,979	12,613
Discontinued operations
Income (loss) from discontinued operations, net of taxes	1,229	(2,048)	1,647	(10,264)
Less: Undistributed net income from discontinued operations allocated to participating securities	0	382	0	1,913
Earnings (loss) from discontinued operations available to common shareholders for basic earnings per share	$ 1,229	$ (1,666)	$ 1,647	$ (8,351)
Denominator:
Weighted average common shares outstanding — basic	42,259	34,302	42,171	34,302
Weighted average common shares upon conversion of participating securities	0	7,857	0	7,857
Dilutive effect of stock options, restricted stock and equity-settled awards	0	264	283	213
Total weighted average shares outstanding — diluted	42,259	42,423	42,454	42,372
Anti-dilutive awards excluded from diluted weighted average shares (in shares)	1,774	1,987	1,663	2,218