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Organization and Capitalization - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Segment
Dec. 31, 2014
Dec. 06, 2013
Organization and Capitalization [Line Items]      
Common stock, shares authorized 750,000,000us-gaap_CommonStockSharesAuthorized 750,000,000us-gaap_CommonStockSharesAuthorized  
Preferred stock, shares authorized     25,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value (in dollars per share)     $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Number of business segments 1us-gaap_NumberOfReportableSegments    
Minimum [Member]      
Organization and Capitalization [Line Items]      
Common stock, shares authorized     225,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]      
Organization and Capitalization [Line Items]      
Common stock, shares authorized     750,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_RangeAxis
= us-gaap_MaximumMember