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Acquisitions - Summary of Revenue and Earnings Included in Consolidated Statement of Income (Detail) - Qualspec Group [Member] - USD ($)
$ in Thousands
6 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
May. 31, 2015
Business Acquisition [Line Items]      
Revenues $ 79,323 $ 589,553 $ 1,011,829
Net income $ 2,748 $ 9,215 $ 41,597