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Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Summary Of Components Of Income Tax Expense Benefit Continuing Operations [Line Items]            
Total deferred income tax expense     $ (4,708) $ (757) $ 3,700 $ 8,378
Current:            
Federal         245 819
State and local         184 320
Total current expense         429 1,139
Deferred:            
Federal         3,610 8,199
State and local         90 180
Total deferred income tax expense     (4,708) (757) 3,700 8,378
Total income tax expense $ 5 $ (1,764) $ (51) $ (131) $ 4,129 9,518
Scenario, Previously Reported [Member]            
Summary Of Components Of Income Tax Expense Benefit Continuing Operations [Line Items]            
Total deferred income tax expense           8,379
Deferred:            
Total deferred income tax expense           $ 8,379