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Income Taxes - Reconciliation Between Cash Dividends Paid and Dividends Paid Deduction (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Dividends paid $ 264,243 $ 239,294 $ 193,101
Plus: Deemed dividends on convertible debt 14,159 12,026 9,987
Less: Dividends designated to prior year (5,594) (6,608) (7,030)
Plus: Dividends designated from the following year 5,594 5,594 6,608
Less: Return of capital (146,466) (172,328) (169,747)
Dividends paid deduction $ 131,936 $ 77,978 $ 32,919