Equity-Based Compensation - Issued And Unvested Shares Of Restricted Stock Granted (Detail) - Restricted stock, time vested	12 Months Ended
	Dec. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued and unvested	3,480,828
First vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued and unvested	1,702,366
Second vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued and unvested	503,315
Third vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued and unvested	1,120,350
Vesting term	4 years
Third vesting, tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Third vesting, tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Third vesting, tranche three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Third vesting, tranche four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Fourth vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued and unvested	15,406
September 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
March 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
September 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Fifth vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued and unvested	49,391
Sixth vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued and unvested	90,000
June 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Quarterly, after June 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	8.00%