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Net Income (Loss) per Share - Basic and Diluted Net Income per Share of Common Stock Using Two-Class Method (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Numerator:                      
Net income $ 22,042us-gaap_NetIncomeLoss $ 19,159us-gaap_NetIncomeLoss $ 23,958us-gaap_NetIncomeLoss $ 17,580us-gaap_NetIncomeLoss $ 15,864us-gaap_NetIncomeLoss $ 12,900us-gaap_NetIncomeLoss $ 11,789us-gaap_NetIncomeLoss $ 11,932us-gaap_NetIncomeLoss $ 82,739us-gaap_NetIncomeLoss $ 52,485us-gaap_NetIncomeLoss $ 40,181us-gaap_NetIncomeLoss
Preferred dividends                 (7,440)us-gaap_PreferredStockDividendsIncomeStatementImpact (7,440)us-gaap_PreferredStockDividendsIncomeStatementImpact (3,079)us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income available to common stockholders 20,182us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 17,299us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 22,098us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 15,720us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 14,004us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 11,040us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 9,929us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 10,072us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 75,299us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 45,045us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 37,102us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Dividends declared on common stock                 (71,089)us-gaap_Dividends (59,008)us-gaap_Dividends (35,899)us-gaap_Dividends
Dividends on participating securities                 (506)ari_ParticipatingSecuritiesDistributedandUndistributedEarningsLossBasicandDiluted (798)ari_ParticipatingSecuritiesDistributedandUndistributedEarningsLossBasicandDiluted (628)ari_ParticipatingSecuritiesDistributedandUndistributedEarningsLossBasicandDiluted
Net income (loss) attributable to common stockholders                 $ 3,704us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (14,761)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 575us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator:                      
Basic weighted average shares of common stock outstanding 46,852,646us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 46,848,675us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 42,888,747us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 37,122,842us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 36,886,619us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 36,883,002us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 36,880,410us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 30,105,939us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 43,464,255us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 35,212,211us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 22,259,386us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average shares of common stock outstanding 47,085,617us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 47,068,929us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 43,099,354us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 37,341,050us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 37,390,369us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 37,379,469us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 37,373,885us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 30,480,689us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 43,684,805us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 35,679,755us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 22,648,819us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic and diluted net income (loss) per weighted average share of common stock                      
Distributable Earnings                 $ 1.64ari_EarningsPerShareBasicandDilutedDistributed $ 1.68ari_EarningsPerShareBasicandDilutedDistributed $ 1.61ari_EarningsPerShareBasicandDilutedDistributed
Undistributed income (loss)                 $ 0.08ari_EarningsPerShareBasicandDilutedUndistributed $ (0.42)ari_EarningsPerShareBasicandDilutedUndistributed $ 0.03ari_EarningsPerShareBasicandDilutedUndistributed
Basic and diluted net income (loss) per share of common stock (in dollars per share) $ 0.43us-gaap_EarningsPerShareBasicAndDiluted $ 0.37us-gaap_EarningsPerShareBasicAndDiluted $ 0.51us-gaap_EarningsPerShareBasicAndDiluted $ 0.42us-gaap_EarningsPerShareBasicAndDiluted $ 0.37us-gaap_EarningsPerShareBasicAndDiluted $ 0.30us-gaap_EarningsPerShareBasicAndDiluted $ 0.27us-gaap_EarningsPerShareBasicAndDiluted $ 0.33us-gaap_EarningsPerShareBasicAndDiluted $ 1.72us-gaap_EarningsPerShareBasicAndDiluted $ 1.26us-gaap_EarningsPerShareBasicAndDiluted $ 1.64us-gaap_EarningsPerShareBasicAndDiluted