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Quarterly Financial Information (Unaudited) - Schedule of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 361,783	$ 331,096	$ 339,331	$ 325,894	$ 346,140	$ 296,129	$ 288,775	$ 265,765	$ 1,358,104	$ 1,196,809	$ 1,149,530
Gross profit	162,386	148,302	153,836	147,339	154,002	132,203	132,963	119,722	611,863	538,891	522,247
Net income attributable to continuing operations	$ 24,883	$ 33,717	$ 33,179	$ 32,371	$ (32,984)	$ 32,066	$ 12,532	$ 14,413	$ 124,150	$ 26,027	$ 92,691
Earnings per share attributable to continuing operations, basic (dollars per share)	$ 0.65	$ 0.88	$ 0.86	$ 0.85	$ (0.87)	$ 0.84	$ 0.33	$ 0.38	$ 3.23	$ 0.68	$ 2.47
Earnings per share attributable to continuing operations, diluted (dollars per share)	$ 0.64	$ 0.86	$ 0.85	$ 0.83	$ (0.87)	$ 0.83	$ 0.32	$ 0.37	$ 3.18	$ 0.67	$ 2.44

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