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Fair Value Measurements - Valuation of Financial Instruments that are Marked-to-Market on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Available-for-sale investments | $ 172,370 | $ 244,088
Fair Value Measurements on a Recurring Basis |  |
Assets |  |
Available-for-sale investments | 172,370 | 244,088
Derivative instruments | 1,384 | 812
Total earning assets | 173,754 | 244,900
Liabilities |  |
Derivative instruments | (454) | (2,584)
Fair Value Measurements on a Recurring Basis | Level 1 |  |
Assets |  |
Available-for-sale investments | 0 | 0
Derivative instruments | 0 | 0
Total earning assets | 0 | 0
Liabilities |  |
Derivative instruments | 0 | 0
Fair Value Measurements on a Recurring Basis | Level 2 |  |
Assets |  |
Available-for-sale investments | 172,370 | 244,088
Derivative instruments | 1,384 | 812
Total earning assets | 173,754 | 244,900
Liabilities |  |
Derivative instruments | (454) | (2,584)
Fair Value Measurements on a Recurring Basis | Level 3 |  |
Assets |  |
Available-for-sale investments | 0 | 0
Derivative instruments | 0 | 0
Total earning assets | 0 | 0
Liabilities |  |
Derivative instruments | $ 0 | $ 0

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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