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Fair Value of Financial Assets and Liabilities - Fair Value Hierarchy of Financial Assets and Liabilities under U.S. GAAP Guidance (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Marketable securities | $ 8,622 | $ 57,623
Loans held for sale | 965,639 | 362,635
Rate lock commitments | 8,750 | 2,923
Forwards | 9,687 | 3,753
Total assets | 992,698 | 426,934
Liabilities: |  |
Accounts payable, accrued expenses and other liabilities—contingent consideration | 23,087 | 23,711
Rate lock commitments | 8,980 | 2,390
Forwards | 2,421 | 657
Total Liabilities | 34,488 | 26,758
Level 1 [Member] |  |
Assets: |  |
Marketable securities | 8,622 | 57,623
Total assets | 8,622 | 57,623
Level 2 [Member] |  |
Assets: |  |
Loans held for sale | 965,639 | 362,635
Total assets | 965,639 | 362,635
Level 3 [Member] |  |
Assets: |  |
Rate lock commitments | 8,750 | 2,923
Forwards | 9,687 | 3,753
Total assets | 18,437 | 6,676
Liabilities: |  |
Accounts payable, accrued expenses and other liabilities—contingent consideration | 23,087 | 23,711
Rate lock commitments | 8,980 | 2,390
Forwards | 2,421 | 657
Total Liabilities | $ 34,488 | $ 26,758

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