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Investments - Summary of Assets and Liabilities Related to Company's Consolidated Variable Interest Entity (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |
Cash and cash equivalents | $ 291,880 | $ 267,738 | $ 331,542 | $ 314,416
Construction in progress included in real estate investments | 2,965 | 2,906 |  |
Other liabilities | 10,716 | 18,472 |  |
Variable Interest Entity [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Cash and cash equivalents | 65 | 57 |  |
Construction in progress included in real estate investments | 2,965 | 2,906 |  |
Accrued expenses | 56 | $ 21 |  |
Other liabilities | $ 26 |  |  |

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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