v2.4.1.9

SCHEDULE 1 STATEMENTS OF CHANGES IN EQUITY (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Balance | $ 282,545,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 278,760,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 278,206,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Repurchase of ordinary shares | (28,902,000)us-gaap_StockRepurchasedDuringPeriodValue | (4,853,000)us-gaap_StockRepurchasedDuringPeriodValue | (4,166,000)us-gaap_StockRepurchasedDuringPeriodValue
Repurchase of ordinary shares, shares | (70,774,015)us-gaap_StockRepurchasedDuringPeriodShares | (11,772,294)us-gaap_StockRepurchasedDuringPeriodShares | (14,812,056)us-gaap_StockRepurchasedDuringPeriodShares
Share-based compensation | 45,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 492,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 1,465,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Exercise of share-based awards | 2,542 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 3,041,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 2,303,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Exercise of share-based awards, shares | 1,815,259 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 2,172,103 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 1,635,252 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Foreign currency translation adjustments | (3,797,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | 4,983,000 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | 3,162,000 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Net income (loss) | (30,361,000)us-gaap_NetIncomeLoss | 124,000 us-gaap_NetIncomeLoss | (2,202,000)us-gaap_NetIncomeLoss
Balance | 222,070,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 282,545,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 278,760,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Parent Company [Member] |  |  |
Balance | 282,576,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 278,789,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 278,227,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Repurchase of ordinary shares | (28,902,000)us-gaap_StockRepurchasedDuringPeriodValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4,853,000)us-gaap_StockRepurchasedDuringPeriodValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4,166,000)us-gaap_StockRepurchasedDuringPeriodValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Share-based compensation | 45,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 492,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,465,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Exercise of share-based awards | 2,542,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,041,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,303,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Foreign currency translation adjustments | (3,797,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,983,000 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,162,000 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss) | (30,361,000)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 124,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,202,000)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Balance | 222,103,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 282,576,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 278,789,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Ordinary shares [Member] |  |  |
Balance | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Balance, shares | 411,474,516 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 408,985,092 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 413,985,636 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Repurchase of ordinary shares |  |  |
Repurchase of ordinary shares, shares | (70,774,015)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (11,772,294)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (14,812,056)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Share-based compensation |  |  |
Exercise of share-based awards |  |  |
Exercise of share-based awards, shares | 12,315,954 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 14,261,718 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 9,811,512 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Foreign currency translation adjustments |  |  |
Balance | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Balance, shares | 353,016,455 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 411,474,516 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 408,985,092 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Ordinary shares [Member] | Parent Company [Member] |  |  |
Balance | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Balance, shares | 411,474,516 us-gaap_SharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 408,985,092 us-gaap_SharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 413,985,636 us-gaap_SharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Repurchase of ordinary shares |  |  |
Repurchase of ordinary shares, shares | (70,774,015)us-gaap_StockRepurchasedDuringPeriodShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (11,772,294)us-gaap_StockRepurchasedDuringPeriodShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (14,812,056)us-gaap_StockRepurchasedDuringPeriodShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Share-based compensation |  |  |
Exercise of share-based awards |  |  |
Exercise of share-based awards, shares | 12,315,954 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 14,261,718 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 9,811,512 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Foreign currency translation adjustments |  |  |
Net income (loss) |  |  |
Balance | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Balance, shares | 353,016,455 us-gaap_SharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 411,474,516 us-gaap_SharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 408,985,092 us-gaap_SharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Additional paid-in capital [Member] |  |  |
Balance | 63,001,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 62,509,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 61,044,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Repurchase of ordinary shares |  |  |
Share-based compensation | 45,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 492,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,465,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Exercise of share-based awards |  |  |
Foreign currency translation adjustments |  |  |
Balance | 63,046,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 63,001,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 62,509,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Additional paid-in capital [Member] | Parent Company [Member] |  |  |
Balance | 63,001,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 62,509,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 61,044,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Repurchase of ordinary shares |  |  |
Share-based compensation | 45,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 492,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,465,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Exercise of share-based awards |  |  |
Foreign currency translation adjustments |  |  |
Net income (loss) |  |  |
Balance | 63,046,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 63,001,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 62,509,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Treasury Stock [Member] |  |  |
Balance | (44,119,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (42,307,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (40,444,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Repurchase of ordinary shares | (28,902,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (4,853,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (4,166,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Share-based compensation |  |  |
Exercise of share-based awards | 2,542,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 3,041,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 2,303,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Foreign currency translation adjustments |  |  |
Balance | (70,479,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (44,119,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (42,307,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Treasury Stock [Member] | Parent Company [Member] |  |  |
Balance | (44,119,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (42,307,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (40,444,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Repurchase of ordinary shares | (28,902,000)us-gaap_TreasuryStockValueAcquiredCostMethod / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (4,853,000)us-gaap_TreasuryStockValueAcquiredCostMethod / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (4,166,000)us-gaap_TreasuryStockValueAcquiredCostMethod / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Share-based compensation |  |  |
Exercise of share-based awards | 2,542,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 3,041,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 2,303,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Foreign currency translation adjustments |  |  |
Net income (loss) |  |  |
Balance | (70,479,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (44,119,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (42,307,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Accumulated other comprehensive income [Member] |  |  |
Balance | 40,734,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 35,751,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 32,589,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Repurchase of ordinary shares |  |  |
Share-based compensation |  |  |
Exercise of share-based awards |  |  |
Foreign currency translation adjustments | (3,797,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 4,983,000 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 3,162,000 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance | 36,937,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 40,734,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 35,751,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Accumulated other comprehensive income [Member] | Parent Company [Member] |  |  |
Balance | 40,734,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 35,751,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 32,589,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Repurchase of ordinary shares |  |  |
Share-based compensation |  |  |
Exercise of share-based awards |  |  |
Foreign currency translation adjustments | (3,797,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 4,983,000 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 3,162,000 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net income (loss) |  |  |
Balance | 36,937,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 40,734,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 35,751,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Accumulated retained earnings [Member] |  |  |
Balance | 222,959,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 222,835,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 225,037,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Repurchase of ordinary shares |  |  |
Share-based compensation |  |  |
Exercise of share-based awards |  |  |
Foreign currency translation adjustments |  |  |
Balance | 192,598,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 222,959,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 222,835,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Accumulated retained earnings [Member] | Parent Company [Member] |  |  |
Balance | 222,959,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 222,835,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 225,037,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Repurchase of ordinary shares |  |  |
Share-based compensation |  |  |
Exercise of share-based awards |  |  |
Foreign currency translation adjustments |  |  |
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