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Debt - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  |  |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  |
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Jun. 30, 2013 USD ($) | Jun. 30, 2012 USD ($) | Jun. 30, 2013 USD ($) | Jun. 30, 2012 USD ($) | Dec. 31, 2012 USD ($) | Jun. 30, 2013 Term Loan [Member] | Dec. 20, 2011 Term Loan [Member] USD ($) | Jun. 30, 2013 Chinese Credit Facility [Member] USD ($) | Dec. 31, 2012 Chinese Credit Facility [Member] USD ($) | Jun. 30, 2013 Chinese Credit Facility-BOA [Member] USD ($) | Jun. 30, 2013 Chinese Credit Facility-BOA [Member] CNY | Sep. 30, 2012 Chinese Credit Facility-BOA [Member] USD ($) | Sep. 30, 2012 Chinese Credit Facility-BOA [Member] CNY | Jun. 30, 2013 Chinese Credit Facility-JPM [Member] USD ($) | Jun. 30, 2013 Chinese Credit Facility-JPM [Member] CNY | Apr. 30, 2012 Chinese Credit Facility-JPM [Member] USD ($) | Apr. 30, 2012 Chinese Credit Facility-JPM [Member] CNY | Jun. 30, 2013 Revolving Credit Facility [Member] USD ($) | Dec. 20, 2011 Revolving Credit Facility [Member] USD ($) | Jun. 30, 2013 Letters Of Credit [Member] USD ($) | Jun. 30, 2013 Borrowings On Same Day-notice [Member] USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing limits |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  | $ 30,000,000 | 189,000,000 |  |  |  |  |  |  |  |
Term Loan Facility, principal amount | 360,000,000 |  | 360,000,000 |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of Term Loan Facility |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Borrowings, maturity date |  |  |  |  |  | Dec. 01, 2016 |  |  |  |  |  |  |  |  |  |  |  | Dec. 01, 2016 |  |  |
Borrowing capacity under Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 | 40,000,000 | 40,000,000
Borrowings, interest rate description |  |  | Interest at LIBOR plus 175 basis points, or the Eurocurrency Spread, or the alternate base rate ("ABR") plus 75 basis points |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings alternate base rate |  |  | 0.75% |  |  | 1.75% |  |  |  | 100.00% | 100.00% |  |  | 100.00% | 100.00% |  |  |  |  |  |
Commitment fee on undrawn amount |  |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis |  |  |  |  |  | 2.00% |  |  |  | 5.60% | 5.60% |  |  | 5.60% | 5.60% |  |  |  |  |  |
Principal repayment of term loan |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments on long-term debt |  |  | 20,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility borrowings | 24,633,000 |  | 24,633,000 |  | 32,145,000 |  |  |  |  | 11,300,000 |  |  |  | 13,300,000 |  |  |  | 0 |  |  |
Total interest and commitments fees | 2,000,000 | 2,100,000 | 4,100,000 | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short term borrowings outstanding |  |  |  |  |  |  |  | 24,600,000 | 32,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Extended revolving credit facility of Chinese subsidiaries with BOA |  |  |  |  |  |  |  |  |  | 22,000,000 | 138,600,000 |  |  |  |  | 20,000,000 | 125,000,000 |  |  |  |
Revolving credit facility, maturity term |  |  |  |  |  |  |  |  |  | 1 year | 1 year |  |  | 1 year | 1 year |  |  |  |  |  |
Payment of interest on Chinese Credit Facilities |  |  |  |  |  |  |  |  |  | $ 10,900,000 | 68,283,570.0 |  |  | $ 3,900,000 | 24,281,546 |  |  |  |  |  |
Interest rate of Chinese Credit Facility BOA |  |  |  |  |  |  |  |  |  | Chinese Credit Facility-BOA currently bears interest at a rate based on 100% of the People's Bank of China's base rate and was 5.6% as of June 30, 2013. | Chinese Credit Facility-BOA currently bears interest at a rate based on 100% of the People's Bank of China's base rate and was 5.6% as of June 30, 2013. |  |  | Chinese Credit Facility-JPM currently bears interest at a rate based on 100% of the People's Bank of China's base rate and was 5.6% as of June 30, 2013. | Chinese Credit Facility-JPM currently bears interest at a rate based on 100% of the People's Bank of China's base rate and was 5.6% as of June 30, 2013. |  |  |  |  |  |

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- Definition The carrying amount of outstanding short term borrowings under our Chinese credit facilities. + References No definition available. + Details
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- Definition Summary of outstanding borrowings and potential borrowings under revolving credit facility. + References No definition available. + Details
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- Definition Term of outstanding term loan and revolving credit facility. + References No definition available. + Details
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- Definition Debt instrument alternate base rate. + References No definition available. + Details
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- Definition Interest and commitment fees. + References No definition available. + Details
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- Definition The increased or maximum borrowing capacity under our Chinese credit facilities. + References No definition available. + Details
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- Definition Percentage of repayment amount on total principal amount of term loan after first year. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition The effective interest rate at the end of the reporting period. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of the required periodic payment applied to interest. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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