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Subsidiary Guarantors - Schedule of Consolidating Statement of Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) $ (7,963)us-gaap_ProfitLoss $ (13,610)us-gaap_ProfitLoss
Other comprehensive income (loss), net of tax:    
Unrealized gain (loss) resulting from changes in fair value of marketable securities (34)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (3)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Other comprehensive income (loss), net of tax (34)us-gaap_OtherComprehensiveIncomeLossNetOfTax (3)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income (loss) (7,997)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest (13,613)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Comprehensive income (loss) attributable to noncontrolling interests 1,308us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest (187)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income (loss) attributable to common stockholders (9,305)us-gaap_ComprehensiveIncomeNetOfTax (13,426)us-gaap_ComprehensiveIncomeNetOfTax
Parent [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) (9,271)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(13,423)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other comprehensive income (loss), net of tax:    
Comprehensive income (loss) (9,271)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(13,423)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Comprehensive income (loss) attributable to common stockholders (9,271)us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(13,423)us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Guarantors [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) 564us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(1,756)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Other comprehensive income (loss), net of tax:    
Unrealized gain (loss) resulting from changes in fair value of marketable securities (34)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(3)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Other comprehensive income (loss), net of tax (34)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(3)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Comprehensive income (loss) 530us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(1,759)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Comprehensive income (loss) attributable to common stockholders 530us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(1,759)us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Non-Guarantors [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) 2,668us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(604)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Other comprehensive income (loss), net of tax:    
Comprehensive income (loss) 2,668us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(604)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Less: Comprehensive income (loss) attributable to noncontrolling interests 1,308us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(187)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income (loss) attributable to common stockholders 1,360us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(417)us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Elimination [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) (1,924)us-gaap_ProfitLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
2,173us-gaap_ProfitLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Other comprehensive income (loss), net of tax:    
Comprehensive income (loss) (1,924)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
2,173us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Comprehensive income (loss) attributable to common stockholders $ (1,924)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
$ 2,173us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember