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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities $ 322,880 $ 341,325 $ 375,373
Net cash used in investing activities (291,057) (124,562) (121,638)
Net cash provided by (used in) financing activities (9,869) (202,291) (281,315)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 21,954 14,472 (27,580)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of year 52,183 37,711 65,291
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of year 74,137 52,183 37,711
Reportable Legal Entities | Parent      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 243,083 276,055 295,366
Net cash used in investing activities (109,114) (55,242) (18,767)
Net cash provided by (used in) financing activities (148,605) (206,446) (280,887)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (14,636) 14,367 (4,288)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of year 25,745 11,378 15,666
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of year 11,109 25,745 11,378
Reportable Legal Entities | Combined Subsidiary Guarantors      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 75,011 65,270 80,007
Net cash used in investing activities (47,940) (69,320) (69,571)
Net cash provided by (used in) financing activities (13,161) 4,155 (33,728)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 13,910 105 (23,292)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of year 26,438 26,333 49,625
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of year 40,348 $ 26,438 26,333
Reportable Legal Entities | Non-Guarantor Subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 4,786    
Net cash used in investing activities (134,003)    
Net cash provided by (used in) financing activities 151,897    
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 22,680    
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of year $ 22,680    
Consolidating Adjustments and Other      
Condensed Financial Statements, Captions [Line Items]      
Net cash used in investing activities     (33,300)
Net cash provided by (used in) financing activities     $ 33,300