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Stockholders' Equity (Details 2)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Reconciliation of the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share    
Common shares outstanding, end of period 37,307,000fix_CommonStockSharesOutstandingExcludingUnvestedSharesContingentlyIssuable 37,597,000fix_CommonStockSharesOutstandingExcludingUnvestedSharesContingentlyIssuable
Effect of using weighted average common shares outstanding (26,000)fix_EffectOfUsingWeightedAverageCommonSharesOutstanding (15,000)fix_EffectOfUsingWeightedAverageCommonSharesOutstanding
Shares used in computing earnings per share - basic 37,281,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 37,582,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of shares issuable under stock option plans based on the treasury stock method 233,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 186,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Effect of contingently issuable restricted shares 91,000us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares 122,000us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Shares used in computing earnings per share - diluted 37,605,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 37,890,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Number of shares of unvested contingently issuable restricted stock outstanding   100,000fix_NumberOfUnvestedSharesContingentlyIssuableExcludedFromComputationOfBasicEarningsPerShare