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Fair Value of Financial Assets and Liabilities - Quantitative Information about Level 3 Fair Value Measurements on Recurring Basis (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018 | Dec. 31, 2017
Level 3 [Member] | Rate Lock Commitments [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | $ 8,750 | $ 2,923 | $ 8,750 | $ 2,923
Liabilities, fair value | 8,980 | 2,390 | 8,980 | 2,390
Level 3 [Member] | Forwards [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 9,687 | 3,753 | 9,687 | 3,753
Liabilities, fair value | 2,421 | 657 | $ 2,421 | $ 657
Minimum [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Discount rate |  |  | 3.00% | 3.00%
Maximum [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Discount rate |  |  | 13.50% | 13.50%
Accounts Payable, Accrued and Other Liabilities [Member] | Contingent Consideration [Member] | Level 3 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Liabilities, fair value | $ 59,242 | $ 67,172 | $ 59,242 | $ 67,172
Accounts Payable, Accrued and Other Liabilities [Member] | Present Value of Expected Payments [Member] | Contingent Consideration [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Discount rate | 8.10% | 8.20% |  |
Probability of meeting earnout and contingencies | 97.00% | 97.00% |  |
Accounts Payable, Accrued and Other Liabilities [Member] | Present Value of Expected Payments [Member] | Contingent Consideration [Member] | Minimum [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Discount rate | 3.30% | 3.30% |  |
Probability of meeting earnout and contingencies | 75.00% | 75.00% |  |
Accounts Payable, Accrued and Other Liabilities [Member] | Present Value of Expected Payments [Member] | Contingent Consideration [Member] | Maximum [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Discount rate | 10.40% | 10.40% |  |
Probability of meeting earnout and contingencies | 100.00% | 100.00% |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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