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Income Taxes - Income Tax Expense (Benefit) Included in Consolidated Statements of Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current:                      
Federal                 $ 13,695 $ 13,124 $ 12,788
Foreign                 47 47 34
State and local                 2,357 2,983 3,095
Total                 16,099 16,154 15,917
Deferred:                      
Federal                 (394) (1,423) (3,261)
State and local                 733 (660) (512)
Total                 339 (2,083) (3,773)
Total income tax expense from continuing operations (2,897) 2,663 4,287 12,385 (1,715) 1,032 2,267 12,487 16,438 14,071 12,144
Operations of discontinued operations                      
Current                 3,246 4,883 4,999
Deferred                 (653) 361 874
Total                 2,593 5,244 5,873
Gain on disposal of discontinued operations:                      
Current                 49,973 52 193
Deferred                 (776)    
Total                 49,197 52 193
Total income tax expense from discontinued operations                 51,790 5,296 6,066
Total income tax expense                 $ 68,228 $ 19,367 $ 18,210