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Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Estimated amount reclassified from accumulated other comprehensive income into income	$ 5,294
Nomura Financial Investment (Korea) Co., Ltd. [Member]
Derivative [Line Items]
Threshold amount of cash collateral		$ 760
Standard Chartered Bank Korea Limited [Member]
Derivative [Line Items]
Threshold amount of cash collateral		$ 1,300
Zero Cost Collar and Forward Contracts [Member] | Nomura Financial Investment (Korea) Co., Ltd. [Member]
Derivative [Line Items]
Threshold amount of cash collateral	500
Cash collateral for credit exposure in derivatives	5,290
Termination provisions for cash and cash equivalents	30,000
Zero Cost Collar and Forward Contracts [Member] | Standard Chartered Bank Korea Limited [Member]
Derivative [Line Items]
Cash collateral for credit exposure in derivatives	$ 700

X

- Definition

Cash collateral for covering credit exposure in derivatives.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Minimum sum of qualified and unrestricted cash and cash equivalents.

+ References

No definition available.

+ Details

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- Definition

Foreign currency exposure.

+ References

No definition available.

+ Details

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X

- Definition

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 6
-URI https://asc.fasb.org/extlink&oid=121549185&loc=d3e80845-113994

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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.

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- Details

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- Details

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