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Reconciliation of Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting [Abstract]        
Total Adjusted Segment EBITDA $ 67,577 $ 76,252 $ 230,325 $ 223,284
Segment depreciation expense (7,920) (6,733) (22,128) (20,237)
Amortization of intangible assets (2,845) (2,900) (8,041) (8,919)
Special charges 0   (6,811)  
Unallocated corporate expenses, excluding special charges (21,738) (20,875) (60,890) (55,057)
Interest income and other 3,213 2,027 9,895 2,840
Interest expense (6,304) (11,696) (18,836) (36,537)
Loss on early extinguishment of debt   (19,589)   (19,589)
Remeasurement of acquisition-related contingent consideration     (980) 1,675
Income before income tax provision $ 31,983 $ 16,486 $ 122,534 $ 87,460