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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Effective tax rate	29.00%	24.00%			23.00%	22.00%
Expected tax rate	23.00%	22.00%	17.00%	21.00%	23.00%	22.00%
US Statutory rate					34.00%
US NOL carryforwards							$ 11,620
U.S. tax deductions for employee stock option gains, the tax benefit							9,093
Expiry Date of Operating Loss carryforward					2022 to 2032
Foreign NOL carryforwards							5,279
Other Foreign Deductible carryforwards							3,491
Expiry Date of other deductible carryforwards					2016-2019
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance for deferred tax assets							$ 2,284

X

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

+ References

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The expiration date of each operating loss carryforward included in total operating loss carryforwards, or the applicable range of such expiration dates.

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State the expiration dates of the tax credit carryforward.

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The portion of the deferred tax asset arising from some other tax carryforward for which it is more likely than not that a tax benefit will not be realized.

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Other foreign deductible carry forwards.

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US tax deductions for employee stock option gains.

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