Annual report pursuant to Section 13 and 15(d)

Summary of Stock Dividends Declared (Detail)

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Summary of Stock Dividends Declared (Detail) - USD ($)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2013
Equity [Abstract]      
Dividends Payable, Date Declared Mar. 05, 2014    
Dividends Payable Date Of Record Day Month And Year Mar. 14, 2014    
Dividends Payable, Date to be Paid Mar. 28, 2014    
Dividends Paid Amount Per Share 0.50%    
Common stock, shares outstanding 58,115,000 58,228,000 37,422,753
Total Stock Dividends Declared $ 193,032