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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 02, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity [Line Items]                    
Treasury shares acquired   200,000                
Shares repurchased during period   $ 5,100           $ 18,649 [1] $ 29,736 [1] $ 32,366 [1]
Received distributions from the earnings of subsidiaries               58,200 55,800 26,900
Capital contributions to subsidiaries               $ 0 $ 0 $ 0
Contingently redeemable common stock, issued shares 1,000,000     0       0 1,000,000  
Redeemable Common Stock. price per share $ 19.00                  
Redeemable Common Stock, required holding period 6 months                  
Redeemable Common Stock, contract terms               Ananke is required to hold the shares of common stock for a minimum of six months and then may: 1) sell up to one-third during the next three-month period, 2) sell another one-third during the next three-month period and 3) sell the remaining purchased thereafter.    
Open Market [Member]                    
Equity [Line Items]                    
Treasury shares acquired               548,100    
Shares repurchased during period               $ 13,600    
Series A [Member]                    
Equity [Line Items]                    
Series A preferred stock pays a cumulative dividend       $ 0.25 $ 0.25 $ 0.25 $ 0.25      
Preferred stock aggregate dividends               $ 10 $ 13  
Series M [Member]                    
Equity [Line Items]                    
Series A preferred stock pays a cumulative dividend               $ 0.20    
Preferred stock aggregate dividends               $ 0 $ 400  
Series M Convertible Preferred Stock                    
Equity [Line Items]                    
Preferred stock repurchased, outstanding shares     2,000              
Stock repurchased and retired during period     $ 256              
[1] See “—Note 8 (Stockholders’ Equity)” for an explanation of events subsequent to December 31, 2014 giving rise to pro-forma stockholders’ equity of $218.9 million as of December 31, 2014.