Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Plans - Summary of Restricted Common Stock Activity (Detail)

v2.4.0.8
Stock-Based Compensation Plans - Summary of Restricted Common Stock Activity (Detail) (USD $)
 12 Months Ended 10 Months Ended 12 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2013
Oct. 31, 2013
MMREIS Common Stock [Member]
Dec. 31, 2012
MMREIS Common Stock [Member]
Oct. 31, 2013
MMREIS Common Stock [Member]
MMREIS Managing Directors [Member]
Dec. 31, 2013
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2013
Restricted Stock [Member]
MMREIS Common Stock [Member]
MMREIS Managing Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock outstanding, beginning balance, Shares         27,999 24,499 28,447  
Issued upon exercise of stock options 913,915       750 3,500 6,462  
Canceled, Shares               (1,866)  
Repurchased, Shares              (8,544)  
Exchange of common stock   234,489 234,489 28,749       (28,749)
Stock outstanding, ending balance, Shares 913,915          27,999 24,499  
Restricted common stock vested ending balance, Shares         28,749 22,682 18,960  
Restricted common stock unvested ending balance, Shares            5,317 5,539  
Nonvested weighted average grant date fair value beginning balance          $ 23.67 $ 23.36 $ 20.95  
Issued/Granted, Weighted-Average Grant Date Fair Value         $ 28.86 $ 25.87 $ 25.28  
Canceled, Weighted-Average Grant Date Fair Value              $ 23.07  
Repurchased, Weighted-Average Grant Date Fair Value             $ 15.40  
Exchange of common stock, Weighted-Average Grant Date Fair Value                   
Nonvested weighted average grant date fair value ending balance           $ 23.67 $ 23.36