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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities $ 301,187 $ 305,741
Net cash used in investing activities (95,963) (225,679)
Net cash provided by (used in) financing activities (227,784) (76,053)
Net increase (decrease) in cash and cash equivalents (22,560) 4,009
CASH AND CASH EQUIVALENTS, beginning of period 65,291 74,393
CASH AND CASH EQUIVALENTS, end of period 42,731 78,402
Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 271,286 182,363
Net cash used in investing activities (35,510) (82,731)
Net cash provided by (used in) financing activities (228,738) (79,552)
Net increase (decrease) in cash and cash equivalents 7,038 20,080
CASH AND CASH EQUIVALENTS, beginning of period 15,666 12,337
CASH AND CASH EQUIVALENTS, end of period 22,704 32,417
Combined Subsidiary Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 29,901 123,378
Net cash used in investing activities (60,453) (75,349)
Net cash provided by (used in) financing activities 954 (64,100)
Net increase (decrease) in cash and cash equivalents (29,598) (16,071)
CASH AND CASH EQUIVALENTS, beginning of period 49,625 62,056
CASH AND CASH EQUIVALENTS, end of period $ 20,027 45,985
Consolidating Adjustments and Other    
Condensed Financial Statements, Captions [Line Items]    
Net cash used in investing activities   (67,599)
Net cash provided by (used in) financing activities   $ 67,599