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Stock-Based Compensation - Summary of Activity for SARs (Detail) - Stock Appreciation Rights (SARs) [Member]
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumed SARs from Newport acquisition, Non-vested SARs | shares 899,851
Granted, Non-vested SARs | shares 0
Exercised, Non-vested SARs | shares (280,106)
Forfeited or expired, Non-vested SARs | shares (20,411)
Non-vested RSUs/SARs - end of period | shares 599,334
Assumed SARs from Newport acquisition, Weighted Average Base Value | $ / shares $ 27.71
Granted, Weighted Average Base Value | $ / shares 0
Exercised, Weighted Average Base Value | $ / shares 26.70
Forfeited or expired, Weighted Average Base Value | $ / shares 30.29
SARs Outstanding - end of period, Weighted Average Base Value | $ / shares $ 28.10