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Reconciliation of Differences from U.S. Federal Statutory Rate (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Expenses [Line Items]      
Pretax book income $ 77,623 $ 48,663 $ 15,213
Federal tax expense at 35% statutory rate 27,168 17,032 5,325
State and local income taxes 3,870 2,619 917
Foreign tax rate differential (41) (14) 0
Reversal of income tax valuation allowance against net deferred tax assets 0 (59,887) 0
(Utilization of) Provisions for valuation allowance for net operating losses and credit carrryforwards - U.S. and states 0 (19,528) (6,060)
Other 97 2,810 (11)
Total consolidated expense (benefit) $ 31,094 $ (56,968) $ 171