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Subsidiary Guarantors - Schedule of Consolidating Statement of Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Condensed Financial Statements, Captions [Line Items]    
Net loss $ (7,614) $ (7,963)
Other comprehensive loss, net of tax:    
Unrealized loss resulting from changes in fair value of marketable securities (83) (34)
Other comprehensive loss, net of tax (83) (34)
Comprehensive loss (7,697) (7,997)
Less: Comprehensive (loss) income attributable to noncontrolling interests (6) 1,308
Comprehensive (loss) income attributable to common stockholders (7,691) (9,305)
Parent [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net loss (7,608) (9,271)
Other comprehensive loss, net of tax:    
Comprehensive loss (7,608) (9,271)
Comprehensive (loss) income attributable to common stockholders (7,608) (9,271)
Guarantors [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net loss 2,264 564
Other comprehensive loss, net of tax:    
Unrealized loss resulting from changes in fair value of marketable securities (83) (34)
Other comprehensive loss, net of tax (83) (34)
Comprehensive loss 2,181 530
Comprehensive (loss) income attributable to common stockholders 2,181 530
Non-Guarantors [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net loss (12) 2,668
Other comprehensive loss, net of tax:    
Comprehensive loss (12) 2,668
Less: Comprehensive (loss) income attributable to noncontrolling interests (6) 1,308
Comprehensive (loss) income attributable to common stockholders (6) 1,360
Elimination [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net loss (2,258) (1,924)
Other comprehensive loss, net of tax:    
Comprehensive loss (2,258) (1,924)
Comprehensive (loss) income attributable to common stockholders $ (2,258) $ (1,924)