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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 215,247 $ 133,906
Net cash used in investing activities (159,356) (41,907)
Net cash provided by (used in) financing activities (89,215) (123,303)
Net decrease in cash and cash equivalents (33,324) (31,304)
CASH AND CASH EQUIVALENTS, beginning of period 74,393 77,919
CASH AND CASH EQUIVALENTS, end of period 41,069 46,615
Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 100,465 147,625
Net cash used in investing activities (19,214) (36,097)
Net cash provided by (used in) financing activities (92,032) (127,882)
Net decrease in cash and cash equivalents (10,781) (16,354)
CASH AND CASH EQUIVALENTS, beginning of period 12,337 31,647
CASH AND CASH EQUIVALENTS, end of period 1,556 15,293
Combined Subsidiary Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 114,782 (13,719)
Net cash used in investing activities (55,143) (5,810)
Net cash provided by (used in) financing activities (82,182) 4,579
Net decrease in cash and cash equivalents (22,543) (14,950)
CASH AND CASH EQUIVALENTS, beginning of period 62,056 46,272
CASH AND CASH EQUIVALENTS, end of period 39,513 $ 31,322
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