XML 73 R63.htm IDEA: XBRL DOCUMENT v3.7.0.1
Equity-Based Compensation - Restricted Stock Activity (Detail) - Restricted Stock Award [Member] - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested, Number of Shares/Units, Beginning balance 844,419 944,562
Granted, Number of Shares 285,008 387,347
Cancelled, Number of Shares (34,026) (122,178)
Vested, Number of Shares (199,764) (365,312)
Unvested, Number of Shares/Units, Ending balance 895,637 844,419
Unvested, Weighted Average Grant-Date Fair Value, Beginning balance $ 55.76 $ 52.74
Granted, Weighted Average Grant-Date Fair Value 42.98 55.38
Cancelled, Weighted Average Grant-Date Fair Value 59.89 57.02
Vested, Weighted Average Grant-Date Fair Value 53.82 47.18
Unvested, Weighted Average Grant-Date Fair Value, Ending balance $ 51.97 $ 55.76