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Share-Based Compensation - Multi-Year Outperformance Plan Agreement (Details) (USD $)
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 15, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payments of Dividends $ 18,654,000us-gaap_PaymentsOfDividends $ 11,778,000us-gaap_PaymentsOfDividends  
New Multi-Year Outperformance Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation 200,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember		 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember		  
New Multi-Year Outperformance Plan | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Opp units issued (in shares)     8,880,579arct_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsMaximumAwardOpportunityAmount
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
Company's market capitalization percentage     5.00%arct_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsMaximumAwardOpportunityPercentageofEquityMarketCapitalization
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
Share-based payment award, award vesting rights 33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember		    
Distribution entitlement percentage 10.00%arct_DistributionEntitlementPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember		    
Payments of Dividends $ 100,000us-gaap_PaymentsOfDividends
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember		    
New Multi-Year Outperformance Plan | Performance Shares | Performance Period      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Absolute Component: 4% of any excess Total Return attained above an absolute hurdle measured from the beginning of such period: 21.00%arct_SharebasedCompensationArrangementbySharebasedPaymentAwardAbsoluteComponentPerformanceTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_VestingAxis
= arct_PerformancePeriodMember		    
100% will be earned if cumulative Total Return achieved is at least: 18.00%arct_SharebasedCompensationArrangementbySharebasedPaymentAwardRelativeComponentOneHundredPercentFundingBenchmarkPerformanceTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_VestingAxis
= arct_PerformancePeriodMember		 [1]    
50% will be earned if cumulative Total Return achieved is: 0.00%arct_SharebasedCompensationArrangementbySharebasedPaymentAwardRelativeComponentFiftyPercentFundingBenchmarkPerformanceTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_VestingAxis
= arct_PerformancePeriodMember		 [1]    
0% will be earned if cumulative Total Return achieved is less than: 0.00%arct_SharebasedCompensationArrangementbySharebasedPaymentAwardRelativeComponentZeroPercentFundingBenchmarkPerformanceTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_VestingAxis
= arct_PerformancePeriodMember		 [1]    
New Multi-Year Outperformance Plan | Performance Shares | Annual Period      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Absolute Component: 4% of any excess Total Return attained above an absolute hurdle measured from the beginning of such period: 7.00%arct_SharebasedCompensationArrangementbySharebasedPaymentAwardAbsoluteComponentPerformanceTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_VestingAxis
= arct_AnnualPeriodMember		    
100% will be earned if cumulative Total Return achieved is at least: 6.00%arct_SharebasedCompensationArrangementbySharebasedPaymentAwardRelativeComponentOneHundredPercentFundingBenchmarkPerformanceTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_VestingAxis
= arct_AnnualPeriodMember		 [1]    
50% will be earned if cumulative Total Return achieved is: 0.00%arct_SharebasedCompensationArrangementbySharebasedPaymentAwardRelativeComponentFiftyPercentFundingBenchmarkPerformanceTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_VestingAxis
= arct_AnnualPeriodMember		 [1]    
0% will be earned if cumulative Total Return achieved is less than: 0.00%arct_SharebasedCompensationArrangementbySharebasedPaymentAwardRelativeComponentZeroPercentFundingBenchmarkPerformanceTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_VestingAxis
= arct_AnnualPeriodMember		 [1]    
New Multi-Year Outperformance Plan | Performance Shares | Interim Period      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Absolute Component: 4% of any excess Total Return attained above an absolute hurdle measured from the beginning of such period: 14.00%arct_SharebasedCompensationArrangementbySharebasedPaymentAwardAbsoluteComponentPerformanceTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_VestingAxis
= arct_InterimPeriodMember		    
100% will be earned if cumulative Total Return achieved is at least: 12.00%arct_SharebasedCompensationArrangementbySharebasedPaymentAwardRelativeComponentOneHundredPercentFundingBenchmarkPerformanceTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_VestingAxis
= arct_InterimPeriodMember		 [1]    
50% will be earned if cumulative Total Return achieved is: 0.00%arct_SharebasedCompensationArrangementbySharebasedPaymentAwardRelativeComponentFiftyPercentFundingBenchmarkPerformanceTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_VestingAxis
= arct_InterimPeriodMember		 [1]    
0% will be earned if cumulative Total Return achieved is less than: 0.00%arct_SharebasedCompensationArrangementbySharebasedPaymentAwardRelativeComponentZeroPercentFundingBenchmarkPerformanceTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_VestingAxis
= arct_InterimPeriodMember		 [1]    
Relative Component | Excess Return, Above Peer Group | New Multi-Year Outperformance Plan | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized, percentage of benchmark 4.00%arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesAuthorizedPercentageOfBenchmark
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ arct_FundingComponentByBenchmarkAxis
= arct_ExcessReturnAbovePeerGroupMember
/ arct_FundingComponentByTypeAxis
= arct_RelativeComponentMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember		    
Relative Component | Cumulative Return, Above Threshold | New Multi-Year Outperformance Plan | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares awarded as a percentage of maximum 100.00%arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesAwardedAsPercentageOfMaximum
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ arct_FundingComponentByBenchmarkAxis
= arct_CumulativeReturnAboveThresholdMember
/ arct_FundingComponentByTypeAxis
= arct_RelativeComponentMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember		    
Relative Component | Cumulative Return, Above Threshold | New Multi-Year Outperformance Plan | Performance Shares | Minimum | Performance Period      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Return percentage threshold 0.00%arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardReturnPercentageThreshold
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ arct_FundingComponentByBenchmarkAxis
= arct_CumulativeReturnAboveThresholdMember
/ arct_FundingComponentByTypeAxis
= arct_RelativeComponentMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VestingAxis
= arct_PerformancePeriodMember		    
Relative Component | Cumulative Return, Above Threshold | New Multi-Year Outperformance Plan | Performance Shares | Minimum | Annual Period      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Return percentage threshold 0.00%arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardReturnPercentageThreshold
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ arct_FundingComponentByBenchmarkAxis
= arct_CumulativeReturnAboveThresholdMember
/ arct_FundingComponentByTypeAxis
= arct_RelativeComponentMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VestingAxis
= arct_AnnualPeriodMember		    
Relative Component | Cumulative Return, Above Threshold | New Multi-Year Outperformance Plan | Performance Shares | Minimum | Interim Period      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Return percentage threshold 0.00%arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardReturnPercentageThreshold
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ arct_FundingComponentByBenchmarkAxis
= arct_CumulativeReturnAboveThresholdMember
/ arct_FundingComponentByTypeAxis
= arct_RelativeComponentMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VestingAxis
= arct_InterimPeriodMember		    
Relative Component | Cumulative Return, Above Threshold | New Multi-Year Outperformance Plan | Performance Shares | Maximum | Performance Period      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Return percentage threshold 18.00%arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardReturnPercentageThreshold
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ arct_FundingComponentByBenchmarkAxis
= arct_CumulativeReturnAboveThresholdMember
/ arct_FundingComponentByTypeAxis
= arct_RelativeComponentMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VestingAxis
= arct_PerformancePeriodMember		    
Relative Component | Cumulative Return, Above Threshold | New Multi-Year Outperformance Plan | Performance Shares | Maximum | Annual Period      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Return percentage threshold 6.00%arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardReturnPercentageThreshold
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ arct_FundingComponentByBenchmarkAxis
= arct_CumulativeReturnAboveThresholdMember
/ arct_FundingComponentByTypeAxis
= arct_RelativeComponentMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VestingAxis
= arct_AnnualPeriodMember		    
Relative Component | Cumulative Return, Above Threshold | New Multi-Year Outperformance Plan | Performance Shares | Maximum | Interim Period      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Return percentage threshold 12.00%arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardReturnPercentageThreshold
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ arct_FundingComponentByBenchmarkAxis
= arct_CumulativeReturnAboveThresholdMember
/ arct_FundingComponentByTypeAxis
= arct_RelativeComponentMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VestingAxis
= arct_InterimPeriodMember		    
Relative Component | Cumulative Return, Equal to Threshold | New Multi-Year Outperformance Plan | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares awarded as a percentage of maximum 50.00%arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesAwardedAsPercentageOfMaximum
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ arct_FundingComponentByBenchmarkAxis
= arct_CumulativeReturnEqualToThresholdMember
/ arct_FundingComponentByTypeAxis
= arct_RelativeComponentMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember		    
Relative Component | Cumulative Return, Below Threshold | New Multi-Year Outperformance Plan | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares awarded as a percentage of maximum 0.00%arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesAwardedAsPercentageOfMaximum
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ arct_FundingComponentByBenchmarkAxis
= arct_CumulativeReturnBelowThresholdMember
/ arct_FundingComponentByTypeAxis
= arct_RelativeComponentMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember		    
Absolute Component | Excess Return, Above Threshold | New Multi-Year Outperformance Plan | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized, percentage of benchmark 4.00%arct_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesAuthorizedPercentageOfBenchmark
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ arct_FundingComponentByBenchmarkAxis
= arct_ExcessReturnAboveThresholdMember
/ arct_FundingComponentByTypeAxis
= arct_AbsoluteComponentMember
/ us-gaap_PlanNameAxis
= arct_NewMultiYearOutperformancePlanMember		    
[1] The “Peer Group” is comprised of the companies in the SNL US REIT Office Index.