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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Effective tax rate	17.00%	13.00%			15.00%	14.00%
Expected tax rate			14.00%	15.00%	15.00%	14.00%
Statutory tax rate					34.00%
U.S. foreign tax credit							$ 5,516
Foreign net operating loss (NOL) carryforwards							4,366
Other Foreign Deductible carryforwards							$ 3,568
Expiry Date of other deductible carryforwards							2016 to 2021
U.S. net operating loss carryforwards							$ 122
2015 [Member]
Operating Loss Carryforwards [Line Items]
Foreign tax credit carryforwards expire amount							944
2023 And 2024 [Member]
Operating Loss Carryforwards [Line Items]
Foreign tax credit carryforwards expire amount							4,572
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance for deferred tax assets							$ 2,378

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