Share-Based Compensation - Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques (Detail) - Share Based Compensation Liability [Member] - Fair Value, Measurements, Recurring [Member] - Monte Carlo Simulation [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
OPP	$ 5,457
Expected volatility	28.00%