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Equity - Schedule of Basic and Diluted Earnings Per Share, or EPS, Based on Weighted-Average of Both Restricted and Unrestricted Class A Common Stock Outstanding (Parenthetical) (Detail) (Class A Common Stock [Member])
 12 Months Ended
Dec. 31, 2014
Class A Common Stock [Member]
  
Reverse stock split ratio 0.1us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember