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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating Loss Carryforwards [Line Items]
Benefit for income taxes	$ (6,698)	$ (22,226)	$ (10,741)	$ (30,747)
Percentage of pre-tax loss			26.00%	33.00%
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Portion of state NOL carryforwards, not able to be utilized before expiration	$ 7,600		$ 7,600

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Operating loss carryforwards not able to be utilized before expiration.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
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