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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Income Taxes [Line Items] |  |  |  |
Provision for income taxes | $ 12,350 | $ 7,187 | $ 37,215 | $ 12,322
Effective tax rate (as a percent) | 38.00% | 49.00% | 42.00% | 46.00%
Increase in deferred tax assets associated with changes in unrealized gain (loss) on marketable securities |  |  | 126 |
Increase in deferred tax assets associated with changes in foreign currency translation adjustment gain (loss) |  |  | 184 |
Unrecognized tax benefits | 526 |  | 526 |
Unrecognized tax benefits that would affect the effective tax rate | 474 |  | 474 |
Unrecognized tax benefits interest and penalties | 17 |  | 149 |
Unrecognized tax benefits accrued interest and penalties | 148 |  | 148 |
Pan [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Deferred tax assets | $ 1,500 |  | $ 1,500 |
Deferred tax assets, valuation allowance (as a percent) | 100.00% |  | 100.00% |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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