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Stock-based Compensation and Outstanding Awards - Summary of Status of Nonvested Shares of RSAs and RSUs (Detail) - Restricted Stock Awards (RSAs) and Restricted Stock Units (RSUs) [Member] - $ / shares
7 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Nonvested shares, beginning balance   2,443,126
Shares, Granted   157,538
Shares, Vested   (199,813)
Shares, Forfeited   (16,400)
Nonvested shares, ending balance 2,443,126 2,384,451
Weighted average grant date fair value, Nonvested beginning balance   $ 30.24
Weighted average grant date fair value, Granted $ 29.02 22.59
Weighted average grant date fair value, Vested   35.20
Weighted average grant date fair value, Forfeited   31.09
Weighted average grant date fair value, Nonvested ending balance $ 30.24 $ 29.31