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Schedule of Unaudited Proforma Results of Operations (Parenthetical) (Detail) (USD $)
In Thousands, except Share data in Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Jan. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Acquisition fees and expenses   $ 23,931us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 18,840us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 6,585us-gaap_BusinessCombinationAcquisitionRelatedCosts
Shares issued to fund acquisition 40.8us-gaap_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationSharesIssued1     36.2us-gaap_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationSharesIssued1
Acquisition-related Costs        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Acquisition fees and expenses   23,900us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_NonrecurringAdjustmentAxis
= us-gaap_AcquisitionRelatedCostsMember
18,800us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_NonrecurringAdjustmentAxis
= us-gaap_AcquisitionRelatedCostsMember
6,600us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_NonrecurringAdjustmentAxis
= us-gaap_AcquisitionRelatedCostsMember
Acquisition-related Costs | Proforma results adjusted to exclude        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Acquisition fees and expenses   $ 20,500us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= ck0001496454_AdjustedToExcludeMember
/ us-gaap_NonrecurringAdjustmentAxis
= us-gaap_AcquisitionRelatedCostsMember
$ 16,500us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= ck0001496454_AdjustedToExcludeMember
/ us-gaap_NonrecurringAdjustmentAxis
= us-gaap_AcquisitionRelatedCostsMember