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Operating Segment Information (Detail) - (Table 2) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Domestic $ 1,653,609,000 $ 1,546,098,000 $ 1,399,551,000
International 1,653,609,000 1,546,098,000 1,399,551,000
Revenues 1,653,609,000 1,546,098,000 1,399,551,000
Domestic (Non-US Title) [Member]      
Segment Reporting Information [Line Items]      
Domestic 323,036,000 329,107,000 312,491,000
International 323,036,000 329,107,000 312,491,000
Revenues 323,036,000 329,107,000 312,491,000
Domestic [Member]      
Segment Reporting Information [Line Items]      
Domestic 1,455,177,000 1,383,841,000 1,258,973,000
International 1,455,177,000 1,383,841,000 1,258,973,000
Revenues 1,455,177,000 1,383,841,000 1,258,973,000
International [Member]      
Segment Reporting Information [Line Items]      
Domestic 198,432,000 162,257,000 140,578,000
International 198,432,000 162,257,000 140,578,000
Revenues $ 198,432,000 $ 162,257,000 $ 140,578,000