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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities $ 264,135 $ 301,187
Net cash used in investing activities (81,760) (95,963)
Net cash provided by (used in) financing activities (177,351) (227,784)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 5,024 (22,560)
CASH AND CASH EQUIVALENTS, beginning of period 37,711 65,291
CASH AND CASH EQUIVALENTS, end of period 42,735 42,731
Reportable Legal Entities | Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 239,662 271,286
Net cash used in investing activities (50,216) (35,510)
Net cash provided by (used in) financing activities (180,702) (228,738)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 8,744 7,038
CASH AND CASH EQUIVALENTS, beginning of period 11,378 15,666
CASH AND CASH EQUIVALENTS, end of period 20,122 22,704
Reportable Legal Entities | Combined Subsidiary Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 24,473 29,901
Net cash used in investing activities (31,544) (60,453)
Net cash provided by (used in) financing activities 3,351 954
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (3,720) (29,598)
CASH AND CASH EQUIVALENTS, beginning of period 26,333 49,625
CASH AND CASH EQUIVALENTS, end of period $ 22,613 $ 20,027