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STOCKHOLDERS' EQUITY. (Dividends) (Detail) - $ / shares
3 Months Ended 6 Months Ended
Feb. 19, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dividends          
Cash dividends declared per share   $ 0.52 $ 0.44 $ 3.04 $ 0.88
Regular cash dividend [Member]          
Dividends          
Cash dividends declared per share       $ 1.04 $ 0.88
Special cash dividend [Member]          
Dividends          
Cash dividends declared per share $ 2