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Information Concerning Guarantor and Non-Guarantor Subsidiaries - Additional Information (Detail)
12 Months Ended
Dec. 31, 2015
USD ($)
Entity
Condensed Financial Statements, Captions [Line Items]  
Number of wholly owned subsidiaries | Entity 4
Ownership percentage in subsidiaries 100.00%
Guarantors [Member]  
Condensed Financial Statements, Captions [Line Items]  
Number of wholly owned subsidiaries | Entity 4
$350 Million 5% Senior Notes [Member]  
Condensed Financial Statements, Captions [Line Items]  
Interest rate of Senior Notes 5.00%
Senior notes, principal amount | $ $ 350,000,000
$400 Million 5% Senior Notes [Member]  
Condensed Financial Statements, Captions [Line Items]  
Interest rate of Senior Notes 5.00%
Senior notes, principal amount | $ $ 400,000,000