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Income taxes - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |
Valuation allowance | $ 26,361,000 | $ 19,124,000 |  |
Net increase in valuation allowance | 7,300,000 |  |  |
Operating loss carry forwards, state, net of tax | 21,900,000 |  |  |
Operating loss carry forwards, foreign, net of tax | 102,700,000 |  |  |
Income tax expense | 25,138,000 | 14,165,000 | 24,031,000 |
Income tax effective rate | 35.80% | (690.00%) | 43.70% |
Income tax effective rate excluding the impact of the charges related to the U.S Government resolutions (as a percent) | 42.00% | 149.10% |  |
Unrecognized tax benefit | 1,200,000 | 600,000 |  |
Accrued interest and penalties related to unrecognized tax benefits | 800,000 | 600,000 |  |
Unremitted foreign earnings | 292,000,000 | 285,300,000 |  |
Total cash and cash equivalents | 31,055,000 | 33,207,000 | 13,561,000 | 13,328,000
U.S. Subsidiary [Member] |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |
Unremitted foreign earnings | 293,800,000 |  |  |
U.S [Member] |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |
Total cash and cash equivalents | 52,300,000 |  |  |
Restricted cash | 21,300,000 |  |  |
Non-Us Subsidiary [Member] |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |
Total cash and cash equivalents | $ 31,000,000 |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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