Income Taxes - Deferred Tax Valuation Allowance (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Balance, beginning of year		$ 1,500	$ 1,500	$ 37,726
Additions		3,000	0
Reductions, net	$ (3,600)	3,000		(36,226)
Balance, end of year	$ 4,500	$ 4,500	$ 1,500	$ 1,500

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant