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Supplemental Cash Flow Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash Flow Supplemental Disclosures [Line Items]      
Interest paid $ 4,993 $ 4,393 $ 5,334
Income taxes net of refunds $ 103,261 $ 82,850 $ 73,168