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Condensed Consolidating Statement of Cash Flows (Unaudited) (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities $ 284,571 $ 264,135
Net cash used in investing activities (230,636) (81,760)
Net cash provided by (used in) financing activities (1,390) (177,351)
Net increase (decrease) in cash, cash equivalents and restricted cash 52,545 5,024
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period 52,183 37,711
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period 104,728 42,735
Reportable Legal Entities | Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 255,765 239,662
Net cash used in investing activities (178,280) (50,216)
Net cash provided by (used in) financing activities (34,631) (180,702)
Net increase (decrease) in cash, cash equivalents and restricted cash 42,854 8,744
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period 25,745 11,378
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period 68,599 20,122
Reportable Legal Entities | Combined Subsidiary Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 19,472 24,473
Net cash used in investing activities (23,098) (31,544)
Net cash provided by (used in) financing activities 1,852 3,351
Net increase (decrease) in cash, cash equivalents and restricted cash (1,774) (3,720)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period 26,438 26,333
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period 24,664 $ 22,613
Reportable Legal Entities | Non-Guarantor Subsidiaries    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 9,334  
Net cash used in investing activities (124,178)  
Net cash provided by (used in) financing activities 126,309  
Net increase (decrease) in cash, cash equivalents and restricted cash 11,465  
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period 11,465  
Consolidating Adjustments and Other    
Condensed Financial Statements, Captions [Line Items]    
Net cash used in investing activities 94,920  
Net cash provided by (used in) financing activities $ (94,920)