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Bonds Payable - Additional Information (Detail) $ in Thousands				12 Months Ended
	Sep. 29, 2017 USD ($)	Aug. 17, 2017 USD ($)	Aug. 17, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Jun. 26, 2014 CNY (¥)
Debt Instrument [Line Items]
Proceeds from issuance of bonds, net				$ 297,581	¥ 1,936,154,000
Bonds 6.875% Due 2017
Debt Instrument [Line Items]
Debt instrument, face amount | ¥						¥ 2,000,000,000
Debt instrument, stated rate						6.875%
Bonds 7% Due 2020
Debt Instrument [Line Items]
Debt instrument, face amount | $	$ 100,000	$ 200,000
Debt instrument, stated rate	7.00%	7.00%
Debt instrument, maturity date	Aug. 17, 2020	Aug. 17, 2020	Aug. 17, 2020
Debt instrument, frequency of periodic payment		Payable semi-annually in arrears on August 17 and February 17 in each year	Payable semi-annually in arrears on August 17 and February 17 in each year
Debt instrument, premium price	100.04
Debt instrument, effective yield	6.98%
Proceeds from issuance of bonds, net		$ 296,085	¥ 1,926,419,000

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Debt Instrument, Premium Price

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