Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Reconciles Provision for Income Taxes (Detail)

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Income Taxes - Summary of Reconciles Provision for Income Taxes (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of federal statutory tax rate to effective rate      
Statutory U.S. federal income tax rate 35.00% 35.00% 35.00%
Income passed through to Partners (12.43%) (12.43%) (25.57%)
State and local income taxes 18.50% 15.60% 6.92%
Permanent items (2.18%) (3.69%) (0.00%)
Life insurance proceeds (0.00%) (0.00%) (5.41%)
Other (0.29%) 2.87% 0.13%
Effective income tax rate 38.60% 37.35% 11.07%