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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 305,741 $ 248,689
Net cash used in investing activities (225,679) (141,494)
Net cash provided by (used in) financing activities (76,053) (136,267)
Net increase (decrease) in cash and cash equivalents 4,009 (29,072)
CASH AND CASH EQUIVALENTS, beginning of period 74,393 77,919
CASH AND CASH EQUIVALENTS, end of period 78,402 48,847
Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 182,363 253,232
Net cash used in investing activities (82,731) (130,102)
Net cash provided by (used in) financing activities (79,552) (144,443)
Net increase (decrease) in cash and cash equivalents 20,080 (21,313)
CASH AND CASH EQUIVALENTS, beginning of period 12,337 31,647
CASH AND CASH EQUIVALENTS, end of period 32,417 10,334
Combined Subsidiary Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 123,378 (4,543)
Net cash used in investing activities (75,349) (81,892)
Net cash provided by (used in) financing activities (64,100) 78,676
Net increase (decrease) in cash and cash equivalents (16,071) (7,759)
CASH AND CASH EQUIVALENTS, beginning of period 62,056 46,272
CASH AND CASH EQUIVALENTS, end of period 45,985 38,513
Consolidating Adjustments and Other    
Condensed Financial Statements, Captions [Line Items]    
Net cash used in investing activities (67,599) 70,500
Net cash provided by (used in) financing activities $ 67,599 $ (70,500)