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Borrowings Under Repurchase Agreements - Additional Information (Detail) £ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) subsidiary | Sep. 29, 2016 USD ($) extension | Jan. 26, 2015 USD ($) | Apr. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2017 GBP (£) | Sep. 29, 2016 GBP (£)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowing outstanding |  |  |  |  |  | $ 1,330,909,000 | $ 1,330,909,000 | $ 1,139,803,000 |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  |  |  | 2,153,412,000 | 2,153,412,000 |  |  |
Borrowing outstanding |  |  |  |  |  | 1,330,909,000 | $ 1,330,909,000 | $ 1,139,803,000 |  |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  |  |  |  | 1.22% | 0.77% |  |
Line of Credit [Member] | JPMorgan Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  |  |  | 1,118,000,000 | $ 1,118,000,000 | $ 943,000,000 |  |
Borrowing outstanding |  |  |  |  |  | 794,404,000 | 794,404,000 | 657,452,000 |  |
Line of Credit [Member] | DB Repurchase Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  | $ 563,813,000 |  |  |  | 563,813,000 | 563,813,000 | 300,000,000 |  |
Borrowing outstanding |  |  |  |  |  | 263,980,000 | 263,980,000 | 137,355,000 |  |
Number of extensions available | extension |  | 2 |  |  |  |  |  |  |  |
Line of credit facility, potential extension period |  | 1 year |  |  |  |  |  |  |  |
Line of Credit [Member] | Goldman Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowing outstanding |  |  |  |  |  | 37,700,000 | 37,700,000 | 40,657,000 |  |
Line of Credit [Member] | UBS Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  |  |  | 133,899,000 | 133,899,000 |  |  |
Borrowing outstanding |  |  |  |  |  | 100,798,000 | 100,798,000 | 133,899,000 |  |
Line of Credit [Member] | DB Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  |  |  | 300,000,000 | 300,000,000 |  |  |
Borrowing outstanding |  |  |  |  |  | $ 143,372,000 | $ 143,372,000 | $ 177,203,000 |  |
Minimum [Member] | Line of Credit [Member] | DB Repurchase Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  |  |  |  | 2.10% |  |  |
Minimum [Member] | Line of Credit [Member] | DB Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  |  |  |  | 1.80% |  |  |
Maximum [Member] | Line of Credit [Member] | DB Repurchase Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  |  |  |  | 3.00% |  |  |
Maximum [Member] | Line of Credit [Member] | DB Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  |  |  |  | 2.32% |  |  |
JP Morgan Facility [Member] | Line of Credit [Member] | JPMorgan Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of indirect wholly owned subsidiaries | subsidiary | 2 |  |  |  |  |  |  |  |  |
Amended and Restated JPMorgan Facility [Member] | Line of Credit [Member] | JPMorgan Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility | $ 1,118,000,000 |  |  |  |  |  |  |  |  |
Debt extension option | 1 year |  |  |  |  |  |  |  |  |
Threshold amount for margin calls (more than) | $ 250,000 |  |  |  |  |  |  |  |  |
Amended and Restated JPMorgan Facility [Member] | Minimum [Member] | Line of Credit [Member] | JPMorgan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  |  |  | 2.25% |  |  |  |
Amended and Restated JPMorgan Facility [Member] | Maximum [Member] | Line of Credit [Member] | JPMorgan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  |  |  | 4.75% |  |  |  |
Repurchase Facility [Member] | Line of Credit [Member] | JPMorgan Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility | 975,000,000 |  |  |  |  |  |  |  |  |
Asset Specific Financing [Member] | Line of Credit [Member] | JPMorgan Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility | $ 143,000,000 |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  | $ 143,000,000 | $ 143,000,000 |  |  |
Asset Specific Financing [Member] | Line of Credit [Member] | DB Repurchase Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  | $ 55,200,000 |  |  |  | 55,200,000 | 55,200,000 |  |  |
General Facility [Member] | Line of Credit [Member] | JPMorgan Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  | 975,000,000 | 975,000,000 |  |  |
General Facility [Member] | Line of Credit [Member] | DB Repurchase Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  | $ 450,000,000 |  |  |  | 450,000,000 | 450,000,000 |  | £ 45,000 | £ 45,000
Goldman Facility [Member] | Line of Credit [Member] | Goldman Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  |  |  | $ 37,700,000 | $ 37,700,000 |  |  |
Covenant terms, minimum consolidated tangible net worth, amount |  |  | $ 750,000,000 |  |  |  |  |  |  |
Covenant terms, maximum debt to tangible net worth ratio |  |  | 3 |  |  |  |  |  |  |
Covenant terms, minimum liquidity |  |  | $ 15,000,000 |  |  |  |  |  |  |
Line of credit facility, covenant terms, total consolidated indebtedness, percent |  |  | 5.00% |  |  |  |  |  |  |
Line of credit facility, covenant terms, minimum net income during any four consecutive quarters |  |  | $ 1 |  |  |  |  |  |  |
Covenant terms, minimum EBITDA to interest expense ratio |  |  | 1.5 |  |  |  |  |  |  |
Goldman Facility [Member] | Line of Credit [Member] | Goldman Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread |  |  | 3.50% |  |  |  |  |  |  |
UBS Facility [Member] | Line of Credit [Member] | UBS Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  |  | $ 133,899 |  |  |  |  |
Line of credit facility, potential extension period |  |  |  |  | 1 year |  |  |  |  |
Covenant terms, maximum debt to tangible net worth ratio |  |  |  |  | 3 |  |  |  |  |
Line of credit, covenant, minimum net asset value |  |  |  |  | $ 500,000 |  |  |  |  |
UBS Facility [Member] | Line of Credit [Member] | UBS Facility [Member] | Six Month LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  |  | 1.55% |  |  |  |  |
DB Facility [Member] | Line of Credit [Member] | DB Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  | $ 300,000,000 |  |  |  |  |  |
Line of credit, covenant, minimum shareholder's equity of gross capital Proceeds |  |  |  | 50.00% |  |  |  |  |  |
DB Facility [Member] | Minimum [Member] | Line of Credit [Member] | DB Facility [Member] | Three Month LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  | 1.80% |  |  |  |  |  |
DB Facility [Member] | Maximum [Member] | Line of Credit [Member] | DB Facility [Member] | Three Month LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  | 2.32% |  |  |  |  |  |
Line of credit facility, non-use commitment fee percentage |  |  |  | 1.80% |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 + Details
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