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Condensed Consolidating Statement of Cash Flows (Unaudited) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities $ 108,479 $ 91,491
Net cash provided by (used in) investing activities (69,850) (19,330)
Net cash used in financing activities (34,412) (66,708)
NET INCREASE IN CASH AND CASH EQUIVALENTS 4,217 5,453
CASH AND CASH EQUIVALENTS, beginning of period 52,183 37,711
CASH AND CASH EQUIVALENTS, end of period 56,400 43,164
Reportable Legal Entities | Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 120,543 84,226
Net cash provided by (used in) investing activities (80,955) (13,642)
Net cash used in financing activities (29,913) (65,480)
NET INCREASE IN CASH AND CASH EQUIVALENTS 9,675 5,104
CASH AND CASH EQUIVALENTS, beginning of period 25,745 11,378
CASH AND CASH EQUIVALENTS, end of period 35,420 16,482
Reportable Legal Entities | Combined Subsidiary Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities (12,064) 7,265
Net cash provided by (used in) investing activities 11,105 (5,688)
Net cash used in financing activities (4,499) (1,228)
NET INCREASE IN CASH AND CASH EQUIVALENTS (5,458) 349
CASH AND CASH EQUIVALENTS, beginning of period 26,438 26,333
CASH AND CASH EQUIVALENTS, end of period $ 20,980 $ 26,682