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Prior Periods Financial Statement Revision - Schedule of Revision on Condensed Consolidated Statements of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					9 Months Ended			12 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016		Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Changes And Error Corrections [Line Items]
Selling, general and administrative expense	$ 16,985		$ 14,201	[1]		$ 52,606	$ 46,931	[1]
Income (loss) from operations	6,296		12,985	[1]		32,294	29,457	[1]
Write-off of unamortized debt issuance costs						8,054	2,589
Interest expense	12,739		15,801	[1]		39,916	48,708	[1]
Income (loss) before provision (benefit) for income taxes and share of net income from joint venture	(5,568)		(8,881)	[1]		(46,302)	(23,282)	[1]
Provision (benefit) for income taxes	(1,436)		(8,246)	[1]		(14,145)	(11,763)	[1]
Net income (loss)	$ 132,895	$ 7,407	$ 4,455	[1]	$ (1,358)	$ 118,561	$ 5,215	[1]	$ 7,299	$ (6,788)	$ 8,217
Basic net income (loss) per share	$ 4.82		$ 0.16	[1]		$ 4.33	$ 0.19	[1]
Diluted net income (loss) per share	$ 4.82		$ 0.16	[1]		$ 4.33	$ 0.19	[1]
As Previously Reported [Member]
Accounting Changes And Error Corrections [Line Items]
Selling, general and administrative expense			$ 18,347		20,712		$ 60,651		80,266	51,745
Income (loss) from operations			18,727		11,874		47,304		59,400	26,797
Write-off of unamortized debt issuance costs									3,089	18,673
Interest expense			16,337				48,924
Income (loss) before provision (benefit) for income taxes and share of net income from joint venture			(3,703)		(3,419)		(5,760)		(7,309)	(22,950)
Provision (benefit) for income taxes			(6,423)		(720)		(6,469)		(9,313)	(10,518)
Net income (loss)		$ 7,407	$ 4,147		$ (1,299)		$ 4,879		$ 7,942	$ (7,431)	$ 8,217
Basic net income (loss) per share			$ 0.15		$ (0.05)		$ 0.18		$ 0.29	$ (0.35)
Diluted net income (loss) per share			$ 0.15		$ (0.05)		$ 0.18		$ 0.29	$ (0.35)
Adjustment [Member]
Accounting Changes And Error Corrections [Line Items]
Selling, general and administrative expense					$ 90		$ (509)		$ (37)	$ 37
Income (loss) from operations					(90)		509		37	(37)
Write-off of unamortized debt issuance costs									(500)	500
Interest expense			$ (466)
Income (loss) before provision (benefit) for income taxes and share of net income from joint venture			466		(90)		509		537	(537)
Provision (benefit) for income taxes			158		(31)		173		1,180	(1,180)
Net income (loss)			$ 308		(59)		$ 336		$ (643)	$ 643
Basic net income (loss) per share			$ 0.01				$ 0.01		$ (0.02)	$ 0.03
Diluted net income (loss) per share			$ 0.01				$ 0.01		$ (0.02)	$ 0.03
As Revised [Member]
Accounting Changes And Error Corrections [Line Items]
Selling, general and administrative expense			$ 18,347		20,802		$ 60,142		$ 80,229	$ 51,782
Income (loss) from operations			18,727		11,784		47,813		59,437	26,760
Write-off of unamortized debt issuance costs									2,589	19,173
Interest expense			15,871				48,924
Income (loss) before provision (benefit) for income taxes and share of net income from joint venture			(3,237)		(3,509)		(5,251)		(6,772)	(23,487)
Provision (benefit) for income taxes			(6,265)		(751)		(6,296)		(8,133)	(11,698)
Net income (loss)			$ 4,455		$ (1,358)		$ 5,215		$ 7,299	$ (6,788)
Basic net income (loss) per share			$ 0.16		$ (0.05)		$ 0.19		$ 0.27	$ (0.32)
Diluted net income (loss) per share			$ 0.16		$ (0.05)		$ 0.19		$ 0.27	$ (0.32)
[1] Includes the effects of discontinued operations (Note 2) and prior periods' revisions (Note 1 and Note 15)

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