Debt - Summary of Debt and Capital Lease Obligations (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total Debt	$ 1,566,754	$ 1,502,554
$200 Million Term Loan A [Member]
Debt Instrument [Line Items]
Total Debt	198,359
$500 Million Term Loan B [Member]
Debt Instrument [Line Items]
Total Debt	489,640
$400 Million Term Loan B [Member]
Debt Instrument [Line Items]
Total Debt		384,727
$350 Million 5% Senior Notes [Member]
Debt Instrument [Line Items]
Total Debt	346,434	345,754
$400 Million 5% Senior Notes [Member]
Debt Instrument [Line Items]
Total Debt	394,874	394,281
$700 Million Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total Debt	136,804	377,133
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Total Debt	$ 643	$ 659