Incentive Award Plan - Vesting Schedule of the Nonvested Shares of Restricted Stock Outstanding (Detail)	Dec. 31, 2016 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested shares	287,827
2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested shares	167,026
2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested shares	60,466
2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested shares	39,158
2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested shares	21,177