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Income Taxes - Income Tax Expense (Benefit) Included in Consolidated Statements of Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:                      
Federal                 $ 18,079 $ 15,749 $ 13,880
Foreign                 43 47 47
State and local                 2,694 1,782 2,311
Total                 20,816 17,578 16,238
Deferred:                      
Federal                 1,060 952 (394)
State and local                 953 1,624 733
Total                 2,013 2,576 339
Provision for income taxes from continuing operations $ (2,226) $ 6,787 $ 4,696 $ 13,572 $ (2,137) $ 4,353 $ 4,824 $ 13,114 22,829 20,154 16,577
Operations of discontinued operations:                      
Current                 (1,263) 51 3,107
Deferred                 68 (222) (653)
Total                 (1,195) (171) 2,454
Gain on disposal of discontinued operations:                      
Current                 427 34 49,973
Deferred                 (344)   (776)
Total                 83 34 49,197
Total income tax expense from discontinued operations                 (1,112) (137) 51,651
Total income tax expense                 $ 21,717 $ 20,017 $ 68,228