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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities $ 213,326 $ 215,247
Net cash used in investing activities (72,542) (159,356)
Net cash provided by (used in) financing activities (135,232) (89,215)
Net increase (decrease) in cash and cash equivalents 5,552 (33,324)
CASH AND CASH EQUIVALENTS, beginning of period 65,291 74,393
CASH AND CASH EQUIVALENTS, end of period 70,843 41,069
Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 158,035 100,465
Net cash used in investing activities (20,643) (19,214)
Net cash provided by (used in) financing activities (132,417) (92,032)
Net increase (decrease) in cash and cash equivalents 4,975 (10,781)
CASH AND CASH EQUIVALENTS, beginning of period 15,666 12,337
CASH AND CASH EQUIVALENTS, end of period 20,641 1,556
Combined Subsidiary Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 55,291 114,782
Net cash used in investing activities (51,899) (55,143)
Net cash provided by (used in) financing activities (2,815) (82,182)
Net increase (decrease) in cash and cash equivalents 577 (22,543)
CASH AND CASH EQUIVALENTS, beginning of period 49,625 62,056
CASH AND CASH EQUIVALENTS, end of period $ 50,202 39,513
Consolidating Adjustments and Other    
Condensed Financial Statements, Captions [Line Items]    
Net cash used in investing activities   (84,999)
Net cash provided by (used in) financing activities   $ 84,999