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Schedule of Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets |  | $ 268,447 | $ 253,821
UNITED STATES |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets |  | 198,855 | 189,195
Foreign |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets | [1] | $ 69,592 | $ 64,626
[1] | As of December 31, 2017 and 2016, long-lived assets attributable to Singapore were $23.6 million and $31.5 million, respectively.

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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