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Goodwill and other intangible assets - estimated annual amortization expense (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
2015 $ 55,750us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths
2016 55,400us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 54,950us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 54,700us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 $ 54,500us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive