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Subsidiary Guarantors - Schedule of Consolidating Statement of Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) $ 943 $ (10,378) $ (7,021) $ (23,988)
Other comprehensive income (loss), net of tax:        
Unrealized gain (loss) resulting from changes in fair value of marketable securities 3 6 (31) 3
Other comprehensive income (loss), net of tax 3 6 (31) 3
Comprehensive income (loss) 946 (10,372) (7,052) (23,985)
Less: Comprehensive income (loss) attributable to noncontrolling interests (82) (3,723) 1,226 (3,910)
Comprehensive income (loss) attributable to common stockholders 1,028 (6,649) (8,278) (20,075)
Parent [Member]        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) 1,025 (6,655) (8,247) (20,078)
Other comprehensive income (loss), net of tax:        
Comprehensive income (loss) 1,025 (6,655) (8,247) (20,078)
Comprehensive income (loss) attributable to common stockholders 1,025 (6,655) (8,247) (20,078)
Guarantors [Member]        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) 11,857 7,728 12,420 5,970
Other comprehensive income (loss), net of tax:        
Unrealized gain (loss) resulting from changes in fair value of marketable securities 3 6 (31) 3
Other comprehensive income (loss), net of tax 3 6 (31) 3
Comprehensive income (loss) 11,860 7,734 12,389 5,973
Comprehensive income (loss) attributable to common stockholders 11,860 7,734 12,389 5,973
Non-Guarantors [Member]        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) (167) (7,596) 2,501 (8,199)
Other comprehensive income (loss), net of tax:        
Comprehensive income (loss) (167) (7,596) 2,501 (8,199)
Less: Comprehensive income (loss) attributable to noncontrolling interests (82) (3,723) 1,226 (3,910)
Comprehensive income (loss) attributable to common stockholders (85) (3,873) 1,275 (4,289)
Elimination [Member]        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss) (11,772) (3,855) (13,695) (1,681)
Other comprehensive income (loss), net of tax:        
Comprehensive income (loss) (11,772) (3,855) (13,695) (1,681)
Comprehensive income (loss) attributable to common stockholders $ (11,772) $ (3,855) $ (13,695) $ (1,681)