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Summary of Changes in Stockholders Equity (Parenthetical) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Equity [Abstract]    
Cumulative effect of change in accounting principle, taxes $ 6,054 $ 13,079
Dividends paid to stockholders, per share $ 0.34 $ 0.32
Unrealized loss due to fair value adjustments on interest rate swap agreements, taxes $ 1,069