Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail)

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Stockholders' Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail) (USD $)
 9 Months Ended
Sep. 30, 2013
Class of Stock [Line Items]  
Dividend Distribution per Share $ 0.80
Monthly Distribution One [Member]
  
Class of Stock [Line Items]  
Dividend Declaration Date Feb. 05, 2013
Record Date Feb. 15, 2013
Dividend Payment Date Feb. 28, 2013
Dividend Distribution per Share $ 0.04
Monthly Distribution Two [Member]
  
Class of Stock [Line Items]  
Dividend Declaration Date Feb. 05, 2013
Record Date Mar. 15, 2013
Dividend Payment Date Mar. 28, 2013
Dividend Distribution per Share $ 0.04
Monthly Distribution Three [Member]
  
Class of Stock [Line Items]  
Dividend Declaration Date Apr. 09, 2013
Record Date Apr. 22, 2013
Dividend Payment Date Apr. 30, 2013
Dividend Distribution per Share $ 0.12
Monthly Distribution Four [Member]
  
Class of Stock [Line Items]  
Dividend Declaration Date Apr. 09, 2013
Record Date May 20, 2013
Dividend Payment Date May 31, 2013
Dividend Distribution per Share $ 0.12
Monthly Distribution Five [Member]
  
Class of Stock [Line Items]  
Dividend Declaration Date Apr. 09, 2013
Record Date Jun. 19, 2013
Dividend Payment Date Jun. 28, 2013
Dividend Distribution per Share $ 0.12
Monthly Distribution Six [Member]
  
Class of Stock [Line Items]  
Dividend Declaration Date Jul. 09, 2013
Record Date Jul. 19, 2013
Dividend Payment Date Jul. 31, 2013
Dividend Distribution per Share $ 0.12
Monthly Distribution Seven [Member]
  
Class of Stock [Line Items]  
Dividend Declaration Date Jul. 09, 2013
Record Date Aug. 21, 2013
Dividend Payment Date Aug. 30, 2013
Dividend Distribution per Share $ 0.12
Monthly Distribution Eight [Member]
  
Class of Stock [Line Items]  
Dividend Declaration Date Jul. 09, 2013
Record Date Sep. 18, 2013
Dividend Payment Date Sep. 30, 2013
Dividend Distribution per Share $ 0.12