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Income taxes - components of provision for income taxes from continuing operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal, Current	$ 12,348us-gaap_CurrentFederalTaxExpenseBenefit	$ (2,996)us-gaap_CurrentFederalTaxExpenseBenefit	$ 21,046us-gaap_CurrentFederalTaxExpenseBenefit
State, Current	1,912	1,736	3,623
Foreign, Current	30,748us-gaap_CurrentForeignTaxExpenseBenefit	36,422us-gaap_CurrentForeignTaxExpenseBenefit	30,389us-gaap_CurrentForeignTaxExpenseBenefit
Federal, Deferred	(6,593)	(9,565)	(34,629)
State, Deferred	3,435	(1,825)	(720)
Foreign, Deferred	(13,200)	(225)	(3,296)
Provision for income taxes from continuing operations	$ 28,650us-gaap_IncomeTaxExpenseBenefit	$ 23,547us-gaap_IncomeTaxExpenseBenefit	$ 16,413us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.