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Reconciliation of Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting [Abstract]    
Total Adjusted Segment EBITDA $ 86,661 $ 71,932
Segment depreciation expense (7,029) (6,991)
Amortization of intangible assets (2,606) (3,012)
Special charges (5,061)  
Unallocated corporate expenses, excluding special charges (18,746) (14,081)
Interest income and other 2,557 (137)
Interest expense (6,229) (12,368)
Remeasurement of acquisition-related contingent consideration (980)  
Income before income tax provision $ 48,567 $ 35,343