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Common and Preferred Stock (Additional Information) (Detail) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended
Nov. 06, 2014
Apr. 30, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Stockholders Equity Note [Line Items]          
Increase in share repurchase authorized amount $ 400,000,000iex_IncreaseInStockRepurchaseProgramAuthorizedAmount        
Purchase of common stock (in shares)     829,744us-gaap_TreasuryStockSharesAcquired 551,148us-gaap_TreasuryStockSharesAcquired  
Repurchase of common stock, including subsequent settlements     62,100,000iex_PaymentsforRepurchaseofCommonStockIncludingSubsequentSettlements 40,100,000iex_PaymentsforRepurchaseofCommonStockIncludingSubsequentSettlements  
Purchase of common stock   2,600,000us-gaap_PaymentsForRepurchaseOfCommonStock 62,132,000us-gaap_PaymentsForRepurchaseOfCommonStock 37,537,000us-gaap_PaymentsForRepurchaseOfCommonStock  
Remaining authorized repurchase amount     483,300,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1    
Common stock, authorized (in shares)     150,000,000us-gaap_CommonStockSharesAuthorized   150,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value (in dollars per share)     $ 0.01us-gaap_CommonStockParOrStatedValuePerShare   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Preferred stock, authorized (in shares)     5,000,000us-gaap_PreferredStockSharesAuthorized   5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value (in dollars per share)     $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare   $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, issued (in shares)     0us-gaap_PreferredStockSharesIssued   0us-gaap_PreferredStockSharesIssued
October Settlement          
Stockholders Equity Note [Line Items]          
Purchase of common stock     $ 2,700,000us-gaap_PaymentsForRepurchaseOfCommonStock
/ us-gaap_ShareRepurchaseProgramAxis
= iex_OctoberSettlementMember