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Subsidiary Guarantors - Schedule of Consolidating Statement of Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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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 | 1,308 us-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) | 564 us-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) | 530 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (1,759)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Comprehensive income (loss) attributable to common stockholders | 530 us-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) | 2,668 us-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) | 2,668 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (604)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Less: Comprehensive income (loss) attributable to noncontrolling interests | 1,308 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (187)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income (loss) attributable to common stockholders | 1,360 us-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 | 2,173 us-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 | 2,173 us-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 | $ 2,173 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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- Definition Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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