v3.5.0.2
Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total principal $ 976,155 $ 1,166,301
Unamortized discount and debt issuance costs (9,504) (1,696)
Total debt 966,651 1,164,605
Less: current portion (155,690) (174,047)
Non-current portion of long-term debt 810,961 990,558
Secured Debt [Member]    
Debt Instrument [Line Items]    
Total principal 509,368 635,330
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Total principal $ 466,787 $ 530,971