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Operating Segment Information (Detail) - (Table 2) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Domestic $ 1,546,098,000 $ 1,399,551,000 $ 1,405,239,000
International 1,546,098,000 1,399,551,000 1,405,239,000
Revenues 1,546,098,000 1,399,551,000 1,405,239,000
Domestic (Non-US Title) [Member]      
Segment Reporting Information [Line Items]      
Domestic 329,107,000 312,491,000 331,481,000
International 329,107,000 312,491,000 331,481,000
Revenues 329,107,000 312,491,000 331,481,000
Domestic [Member]      
Segment Reporting Information [Line Items]      
Domestic 1,383,841,000 1,258,973,000 1,255,709,000
International 1,383,841,000 1,258,973,000 1,255,709,000
Revenues 1,383,841,000 1,258,973,000 1,255,709,000
International [Member]      
Segment Reporting Information [Line Items]      
Domestic 162,257,000 140,578,000 149,530,000
International 162,257,000 140,578,000 149,530,000
Revenues $ 162,257,000 $ 140,578,000 $ 149,530,000