Equity-Based Compensation - Issued And Unvested Shares Of Restricted Stock Granted (Detail) - Restricted stock, time vested	Dec. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued and unvested (in shares)	2,644,030
First vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued and unvested (in shares)	1,335,700
Second vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued and unvested (in shares)	419,283
Third vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued and unvested (in shares)	889,047