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Borrowings - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Line of Credit Facility [Line Items] |  |
Line of credit, amount outstanding | $ 202,033 | $ 225,158
Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of credit, amount outstanding | 202,033 | 225,158
Wells Fargo [Member] | Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of credit, amount outstanding | 47,751 | 225,155
Maximum Month-End Balance | 225,156 | 469,147
Average Month-End Balance | 168,747 | 283,100
UBS [Member] | Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of credit, amount outstanding | 133,899 | 0
Maximum Month-End Balance | 133,899 | 0
Average Month-End Balance | 31,728 | 0
JP Morgan Chase [Member] | Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of credit, amount outstanding | 20,383 | 3
Maximum Month-End Balance | 20,383 | 68,720
Average Month-End Balance | $ 3,138 | $ 37,461

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityAverageOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum month-end amount borrowed under the credit facility during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section VII -Subsection 2 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumMonthendOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration