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Borrowings - Remaining Maturities of Borrowings (Detail) (Line of Credit [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Line of Credit Facility [Line Items]  
Less than 1 year $ 47,955
1 to 3 years 25,183
3 to 5 years 128,895
More than 5 years 0
Total 202,033
Wells Fargo [Member]
  
Line of Credit Facility [Line Items]  
Less than 1 year 47,751
1 to 3 years 0
3 to 5 years 0
More than 5 years 0
Total 47,751
UBS [Member]
  
Line of Credit Facility [Line Items]  
Less than 1 year 0 [1]
1 to 3 years 5,004 [1]
3 to 5 years 128,895 [1]
More than 5 years 0 [1]
Total 133,899 [1]
JP Morgan Chase [Member]
  
Line of Credit Facility [Line Items]  
Less than 1 year 204 [1]
1 to 3 years 20,179 [1]
3 to 5 years 0 [1]
More than 5 years 0 [1]
Total $ 20,383 [1]
[1] Assumes extension options are exercised.