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Reconciliation of Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Total Adjusted Segment EBITDA $ 80,385 $ 79,510 $ 150,937 $ 154,870
Segment depreciation expense (7,512) (6,944) (15,060) (13,820)
Amortization of other intangible assets (3,452) (5,953) (8,068) (11,517)
Special charges (9,364)   (9,364) (427)
Unallocated corporate expenses, excluding special charges (21,386) (14,570) (41,779) (31,734)
Interest income and other 1,448 (387) 2,451 550
Interest expense (12,908) (13,071) (25,563) (25,786)
Remeasurement of acquisition-related contingent consideration 261 8,216 2,383 8,216
Income before income tax provision $ 27,472 $ 46,801 $ 55,937 $ 80,352