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Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Warranty Accrual Activity [Roll Forward]  
Balance $ 9,537us-gaap_ProductWarrantyAccrual
Additions charged to costs and expenses 2,011us-gaap_ProductWarrantyAccrualWarrantiesIssued
Deductions (2,878)us-gaap_ProductWarrantyAccrualPayments
Other (227)rop_ProductWarrantyAccrualIncreaseDecreaseCurrencyTranslationBusinessAcquisitionsAndOtherAdjustments
Balance $ 8,443us-gaap_ProductWarrantyAccrual