Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Schedule of Amount Due from (to) Affiliates (Detail)

v2.4.0.8
Related-Party Transactions - Schedule of Amount Due from (to) Affiliates (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
General and administrative expense [Member]
Dec. 31, 2012
General and administrative expense [Member]
Sep. 30, 2013
Tax [Member]
Dec. 31, 2012
Tax [Member]
Sep. 30, 2013
Dividend Declared [Member]
Sep. 30, 2012
Dividend Declared [Member]
Dec. 31, 2012
Cash sweep [Member]
Related Party Transaction [Line Items]                  
Cash sweep receivable from MMC                 $ 71,905
Preferred stock dividends             (6,500) 0  
Taxes and general and administrative expenses payable to MMC     (538) (383) (6,490) (11,133)      
Due from (to) affiliates $ (13,528) $ 60,389