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Commitments and Contingencies - Schedule of Future Minimum Sublease Income under Non-Cancelable Sublease Agreements (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]  
2015 $ 624tph_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueCurrent
2016 711tph_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueInTwoYears
2017 535tph_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueInThreeYears
Future minimum sublease income under non-cancellable sublease agreements $ 1,870us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals