Income Taxes - Net Operating Losses Carryforwards Expire (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($)
Operating Loss Carryforwards [Line Items]
U.S. loss carryforwards	$ 244,923
State loss carryforwards	$ 172,259
Federal \| Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2031
Federal \| Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2035
State \| Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2014
State \| Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2035

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 25
-Paragraph 20
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319

Name:	us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant